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You cannot tell what the date of manufacture is based on the serial number of the gun alone. You must also know the model of the gun. For dates of manufacture for Winchester guns, go to: http://armscollectors.com/sn/windates.htm
Serial number data can be located on the Browning website, Blue Book of Gun values and Browning Dates of Manufacture book.
Yes.
For Colt, go to proofhouse.com
No serial number provided; no way to answer.
The gun was made in 1941 You can research dates of manufacture by going to: http://armscollectors.com/sn/winlookup.php
This gun was made in 1960
This gun was made in 1976
According to the serial number, you have a Crass model gun. The manufacture date is around 1898. Check out www.ithacagunrepair.com.
This gun was made in 1952.
The gun was made in 1953
This gun was made in 1954