If the poly choke was factory then it's likely a 750AC. However, since it was so easy for a gunsmith to add a poly choke to a barrel it could possibly be a number of different models. Here's a list of all the Browning A5 based Savage shotgun models that were offered.
720 - Made from 1930-49
726 - 1931-49
Same as 720 but with 2 shell magazine
740C Skeet - 1936-49
Same as 726 with Cutts Compensator & skeet stock, 24-1/2" barrel
745 Lightweight - 1940-49
Same as 720 but with alloy receiver
750 - 1960-69
750SC - 1960-69
Same as 750 but with Savage Super Choke
750AC - 1960-69
Same as 750 but with Poly Choke
Here's a link with some good detailed photo's of a 750AC.
http://www.gunauction.com/buy/8539160#
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