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