Call S&W and they will tell you when it left the factory.
Ruger's website has sn data you can access
Browning.com has a sn function under customer service.
1957
1912
You will have to post the sn or call Browning.
Proofhouse.com has sn information.
No sn data available.
Around 1912.
1970. You can request a factory letter for @ 40 USD
Browning's web site has a sn search function.
Browning has sn data available on their webiste under Customer Service.
Impossible to answer without a detailed description. Auto? O/U? SXS?