There were a number of different models. Check out this link
http://www.airgunspares.com/store/content/87/BSA/ Most Martini actioned B.S.A. rifles start with a 'U' prefix so scroll down the page a bit. John Knibbs holds all the records for B.S.A. and is usually most helpful. The original number with the prefix letter should be somewhere on the gun. Some of the old target rifles with the heavy barrels are extremely accurate and sought after. The above should help in identifying the model and John should be able to supply date made etc. Lagopus.....
