1. Glock Serial Number Manufacture Date
2. Ruger M77 Serial Numbers Manufacture Dates
3. Weatherby Serial Numbers Manufacture Dates

The product ID tag and serial number can tell you the month and year it was manufactured, and for the Aquarite/Goldline SWCG cells the length of the warranty. The format has changed a bit through the years and below are the different formats Hayward has used.

• Please enter the serial number of your firearm below and click search. This application only works for firearms imported and distributed by Beretta USA Corp. From 1988 to date. If the search does not provide a return, your firearm may be older in which case you should see this link. For the search to work, please enter your serial number in all.
• The following serial number information is for Remingtion firearms manufactured after 1921. Remingtons manufactured after 1921 have a code located on the left side of the barrel near the frame that identifies the year and month of manufacture. The following letters correspond to the months of the year, for example B=January, L= February and so on.
• Enter your True product's serial number to view specific information pertaining to the cabinet.

Military Krag- U.S. Rifles and Carbines Models 1892 to 1899: Covering numbers: 1 - 484000. Please enter a serial number and click the submit button.

Pumps, Filters, Cleaners, Heaters, Heat Pumps, some Incandescent Lighting and Accessories

Hayward's serial numbers for all products, with the exception of some cleaners, controls, heat pumps and electronic chlorinators, are 17 digits long and begin with the numbers '21'. Often these numbers appear on product labels with spaces or parentheses.^[1]

Model number is found on the dataplate located on the bottom right of the electrical cover on Hayward Heat Pro units.^[2]

On Summit style Heat Pumps the data plate is located on the left side of the base pan

Controls, Electronic Chlorination, ColorLogic Lighting

Serial numbers for Controls, Electronic Chlorination, and ColorLogic Lighting typically follow a format like this: 1M12345-1234567 (all numbers with the exception of the letter in the second position).

For products such as Aqua Rite, the serial number can be found inside the door of the control

Heat Pumps, Heaters, Filters, Pumps August 2015 - Present

Format is 2112-1911-003216017.^[3] In this example, manufacturing date is November 2019.

• The first two numbers (21)are common to all ID tags
• The 3rd - 4th number is the plant of manufacture
  • 10 = Canada
  • 11 = Pomona, CA
  • 12 = Clemmons, NC
  • 13 = Nashville, TN
• The 5th % 6th number will be the year & the 7th & 8th is the month
  • 1911 = November 2019
  • 1912 = December 2019

Heat Pumps, Heaters, Filters, Pumps March 2010 - July 2015

Format is (21) 12-1004-000002006.^[4] In this example, manufacturing date is March of 2010.

• The first two numbers (21)are common to all ID tags
• The 3rd - 4th number is the plant of manufacture
  • 10 = Canada
  • 11 = Pomona, CA
  • 12 = Clemmons, NC
  • 13 = Nashville, TN
• The 5th & 6th number will be the year & the 7th & 8th is the month
  • 1003 = March 2010
  • 1006 = June 2010

Heat Pumps, Heaters, Filters, Pumps February 2004 - February 2010

Format is (21) 120-402-000002006

• The first two numbers (21) are common to all ID tags
• The 3rd - 5th number is the plant of manufacture
  • 100 = Canada
  • 110 = Pomona, CA
  • 120 = Clemmons, NC
  • 130 = Nashville, TN
• The 6th -8th number will be the year & month Example:
  • 402 = 2004, Feb
  • 405 = 2004, May
  • 501 = 2005, Jan
  • 502 = 2005, Feb

Reading Goldline Serial Numbers August 2011 - Present

Beginning 08-05-2011 the serial number format is 4A20021-104377.^[5]

• First Digit = Standard Warranty length
  • 4 = 4 Year Warranty
  • 3 = 3 Year Warranty
  • 1 = 1 Year Warranty
• Second Character = Product Family
  • A = Aquarite
  • R = remote
• Third & Fourth Digit indicate the year the product was made
  • 20 = 2020
• Fifth - seventh digit = day of year manufactured
  • 021 = 21st day of 2020
• Digits 8 and on = 123456 = Manufacturing ID

Reading Goldline Serial Numbers November 2001 – July 2011

Beginning 11-01-01 the serial number format is 1R0509-1020020.

• First Digit
  • 3 Year Warranty
  • 1 = 1 Year Warranty
• Second Character = Product Family
  • A = Aquarite
  • R = remote
• Third & Fourth Digit indicate the year the product was made
  • 05 = 2005
• Fifth & Sixth Digit indicate months of manufacture
  • 09= September
• Digits 7 and on = 123456 = Manufacturing ID

.

1. ↑https://www.haywardnet.com/warranty/hint.cfm?lang=en&prodID=359
2. ↑http://www.haywardnet.com/pdfs/Heatpump-Troubleshooting-Guide.pdf
3. ↑https://www.totallyhayward.com/techservices/attachments/Technical%20Updates%20for%20Pool%20Professionals%20Jan%20%202020.pdf
4. ↑https://www.totallyhayward.com/techservices/attachments/Serial%20Number%20Read%20REVISED%201-2012.pdf
5. ↑https://www.totallyhayward.com/techservices/attachments/How%20to%20read%20Goldline%20Serial%20Numbers.pdf

FIREARMS INFORMATION

Remington never (*) (**) used serial numbers to identify the date of manufacture of it's firearms, they however stamped a date code (spelled out below) by the first letter meaning the month and the last letter the yearof manufacture.

BARREL DATE CODE - stamped exposed on LH top rear of barrel after 1920

the following will only be stamped where applicable

#2 Part order barrel (not originally assembled to firearm)

#3 Service section received

#4 Return as received

#5 Employee sale

R.E.P. On the RH side of the barrel will be a Magnaflux, Remington proof & a test mark

If a gun is returned to the factory as a fire damaged, or blown up firearm, the factory will stamp it as a prefix to their date code with a #4 on the barrel and return it un-repaired. Then if the gun is ever subsequently returned to a warranty center or the factory by ANYONE, they will refuse to work on it as an unsafe firearm.

REMINGTON MANUFACTURING DATE CODE

stamped on LH top rear of barrel, 2 or 3 digit, (month first, year after) these will normally only be the last letters as seen below,

with the whole list shown here ONLY if it had been returned for repairs
The anchor shown here with the date code is just a symbol, as many different inspector marks will be seen

The above information was taken from Remington's own information sheet, so if your gun may not conform, then I am also at a loss in explaining.

The factory says all barrels are date code stamped, well I have found some that are not, or if they are, are so erratic stamping that trying to decipher them is impossible.

The photos below may help a bit. Both were taken off Remington 760s, with the one on the left, a 30-06 that I bought new October 10, 1954. This has been rebored to a 35 Whelen Improved. The one on the right again a 30-06, but with a shorter barrel that I made into a knock around quad rifle with pivot mounts.

Here the R represents November, & the ZZ would be 1953. The fourth digit being a 3 is inconsequential being an assembly number. There is no inspector mark on this side.

Here the first (LH) mark is the final inspector mark, the O represents July, the R would be 1968. And the F again being an assembly number.

JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC
B	L	A	C	K	P	O	W	D	E	R	X

1920 = L	1930 = Y	1940 = J	1950 = WW
1921 = M	1931 = Z	1941 = K	1951 = XX
1922 = N	1932 = A	1942 = L	1952 = YY
1923 = P	1933 = B	1943 = MM	1953 = ZZ
1924 = R	1934 = C	1944 = NN	1954 = A (JAN. AA)
1925 = S	1935 = D	1945 = PP	1955 = B
1926 = T	1936 = E	1946 = RR	1956 = C
1927 = V	1937 = F	1947 = SS	1957 = D
1928 = W	1938 = G	1948 = TT	1958 = E
1929 = X	1939 = H	1949 = UU	1959 = F

1960 = G	1970 = T	1980 = A	1990 = K
1961 = H	1971 = U	1981 = B	1991 = L
1962 = J	1972 = W	1982 = C	1992 = M
1963 = K	1973 = X	1983 = D	1993 = N
1964 = L	1974 = Y	1984 = E	1994 = O
1965 = M	1975 = Z	1985 = F	1995 = P
1966 = N	1976 = I	1986 = G	1996 = Q
1967 = P	1977 = O	1987 = H	1997 = R
1968 = R	1978 = Q	1988 = I	1998 = S
1969 = S	1979 = V	1989 = J	*1999 = T

(*) Typically from the beginning, they NEVER used serial numbers to DATE their long firearms, but date codes. That does not preclude them from also assigning serial numbers. However for factory purposes, serial numbers were not the primary method of dating a firearm. Long guns made before 1941 (WWII) were serial numbered, even the 22 calibers. After the war with numerous new 22 caliber models being introduced, serial numbers were not assigned to ALL GUNS until the Federal Gun Control Act of 1968.

(**) On 8/9/99, they stopped stamping the barrels with the date code. They however continued to mark the date code on the end flap of the shipping box for shotgun barrels however. They planned on using just the serial numbers to tell when the gun was manufactured. So there was a 2 year gap in rifle date coded barrels and the normal consumer, or gunsmith would have to contact the factory for this information. They then saw the error of their ways apparently because of being inundated by phone calls and resumed stamping the date code on the barrel on 10/1/01.

*2000 = U	2006 = A	2012 = G	2018 = M
*2001 = V	2007 = B	2013 = H	2019 = N
2002 = W	2008 = C	2014 = I	2020 = O
2003 = X	2009 = D	2015 = J	2021 = P
2004 = Y	2010 = E	2016 = K	2022 = Q
2005 = Z	2011 = F	2017 = L	2023 = R

You will notice the year code repeats itself, but over 20 years difference. in this instance, you will need to know when each model was manufactured. To find general manufacturing dates it may be best to go to the Blue Book of Gun Values, which does give manufacturing dates of most models. So even if it (the code stamping) was used on the same model that could have been production over MANY years, in all likelihood sights or stocks would be different which would indicate the different date.

You will also notice the month code spelling out BLACKPOWDERX, this is a common code in the firearms industry. Also some letters were left out if there was a chance of misidentifying a date. Also they jockeyed year letters to a new starting point in 1980.

Glock Serial Number Manufacture Date

Also for the 870 and 1100 series shotguns there was a code to identify caliber/size of the actions.
M/870 LETTER PREFIX
1950 TO APPROX 1968: NO SERIAL NUMBER PREFIX
1968 TO PRESENT: LETTERS USED (IN SEQUENCE) S-68, T-74, V-78, W-84, X-90, A-91, B-94, C-97, D-01, AB-05

Ruger M77 Serial Numbers Manufacture Dates

LETTER SUFFIX (DESIGNATES GAUGE)
V 12 GA. (2 3/4”)
M 12 GA. MAGNUM (3”)
A 12 GA. “SUPER” MAGNUM (3 ½”)
W 16 GA. ( 2 ¾” )
X 20 GA. “HEAVY FRAME” (DISCONTINUED)
N 20 GA. “HEAVY FRAME MAGNUM” (DISCONTINUED)
K 20 GA. “LIGHT WEIGHT” (“LW”) (ALSO INCLUDES M/1100 “LT”)
U 20 GA. LW MAGNUM (ALSO INCLUDES M/1100 “LT”)
J 28 GA.
H .410 BORE (2 ½” OR 3”)
MODEL 1100 LETTER PREFIX
1964 TO APPROX. 1968: NO SERIAL NUMBER PREFIX
1968 TO PRESENT: LETTERS USED (IN SEQUENCE) L-68, M-74, N-78, P-85, R-90
LETTER SUFFIX
SAME STRUCTURE AS THE M/870

If you find marks on the underside of the barrel, they will more than likely be fitters or assembly marks, which mean nothing as to dating the firearm.

I have seen one EARLY 740 S/N 54,9XX that has a barrel date coded May of 1969, which apparently had been sent back to the factory and rebarreled with a original 740 barrel instead of a 742 which was in production at that time.

Weatherby Serial Numbers Manufacture Dates

An issue that people need to be aware of, is that many Remington firearms such as the 870 series of shotguns can have their barrels easily changed or replaced. So, if the barrel is not original to the specific firearm in question the barrel date code may be meaningless. Also if there is a custom or aftermarket barrel installed it will not have these factory codes.
Compunding the issue a bit may be the fact that Remington Arms stamps their final inspector stamps and assembly (product) codes in the immediate area of the date codes. So it may be difficult at times to determine exactly what is what. With that in mind, and considering a lot of variables. If a specific Remington firearm has a serial number, Remington Customer Service is always the first source which should be checked for date of manufacture as they would be the definitive source. There are no publically accessible databases for Remington serial numbers.

With the hundreds of different Remington models produced over the past 200 years, it can sometimes be difficult to determine the age of your firearm.

Overview
Since serial numbers were not required until 1968, your firearm may not have a serial number. For models without a serial number, we may be able to determine the age by the 2-3 letters that are stamped on the barrel. If your firearm does have a serial number, if you will call or email to the address below, the serial number and model number we can determine the approximate age of your firearm.
Contact Remington through their Help Center by e-mail at info@remington.com or call their historian at 1-800-243-9700 Mon-Fri 9-5 EST. (this number may not be operationa since Remington moved to the deep south).

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Originated 01-29-2007, Last updated 02-24-2021
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