The Model 61 was never very popular and were made between 1970-73. Yours will be worth about $450, only because it is complete with the original box, case, and paperwork. Cool little gun though.

Find the model number on the gun itself (do this will all your father's S&Ws) and please let us know what it actually says? In this case, you have a Model 61, 61-1, 61-2, or 61-3. This is very important info to a collector.