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By it's serial number.Go to proofhouse.com to find the date of manufacture.
The date of manufacture is determined by the Colt model type and serial number. See: www.proofhouse.com/colt/index.html
The first six digits of the serial number: for example 021703... would be February 17th 2003.
Compare it against known examples with a good date of manufacture.
The serial number is needed to determine the manufacture date.
Serail number and features
Go to the Winchester Official Website enter serial # and it should be able to look up the specific gun, and hopefuly the manufacture date
need the actual serial number to determine the manufacture date of the rifle.
I own a Colt .45 Government Model C155009 can you tell me the mfg date and estimate value?
You will have to call Browning.
IIRC, Cornell Publications might have a book that can help
Go to Browning's site, click on Support then date your firearm.