I bought this 20 GA SxS Ithaca many years ago. Based on the serial number, I believe it was made in 1940. The right barrel is a modified choke, the left is full. Double triggers, extractors.
The receiver is nicely color case hardened, and it has a pointer dog engraved on the receiver.
It has been a good shotgun for rabbits, squirrels and birds at longer ranges.
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Sam......