made in 1972
Rifle or pistol?
The caliber should be marked on the slide.
1914-1955. Browning does not have sn's available.
You did not provide the sn, so the question can't be answered.
No way to answer without a detailed description of all markings, caliber/gauge, etc..
http://proofhouse.com/browning/index.html The above site has SN lists. The SN you list is @ 40 years old.
You will have to call Browning.
Browning.com has a sn function listed under customer service you can use.
Serial numbers do not designate calibers. Look on the brrel to ID the caliber.
Please specify which marks you are talking about.
browning 2725
Impossible to answer without a DETAILED description to include caliber, finish, condition, box, papers, accessories, model, sights and serial number.