OK, I talked to the guy and found out a bit more. Serial number is 1605xx. (1909?)It is a 12. Barrels are stamped Royal Steel. 30" barrels. A single F with the serial number and CC stamped on the underside of both barrels.

No dings in the barrels. No cracks in the wood (some indentations from being used)

Here are my questions. Does it have short chambers (I assume so) and can anyone estimate a ball park value? Not many hammer guns to judge by on the auction sites.

Thanks,
Shane