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The 745b was made between 1940 and 1949.
Mfg. 1940-49
The value of a Savage 745b in very good, clean condition is around $300 retail. These are excellent shooters, as I hunt with one every year, and are a close copy of the auto 5 Browning. They don't have much collectability, but are one of the best hunting shotguns you can have, due to their lightweight receiver. Auto 5 parts won't interchange, but you can get replacement parts through Gun Parts Corp.
12 guage shell?
Depending on the condition of the gun between $275.00-$110.00.