What type of macgregor putter would this be?

i know nothing about the putter but i think its really old maybe not but all i can tell you is it is bronze head steal shaft and all it has on it is 315 stamped on in and macgregor stamped on it? any help on finding out what type of putter it could be and how old it could be wold be fantastic thak you|||On golf artifacts they list it as a 1940 era bronze flanged putter - They have one in excellent condition on sale for 30 dollars