Chuck does your barrel bottom have this type of re-inforcement.
This is from a Field Grade Longrange Wildfowl gun 3" chambered, 32" barrels.
The Trap Grade was introduced in 1913 until 1939. It has on the side plates, men lined up at the traps and a sportsman in the field on the other. On the right barrel will be L.C. Smith Trap Grade.
In 1920 they came out with a double barrel trap gun in Specialty, Eagle, Crown and Monogram. It came with a Beavertail Fore end, Hunter One-Trigger and ejectors. The only way to tell this gun apart from the others is that they usually stamped a "T" on the water tables but not in all cases. The only real way to tell is to check the stock measurements as they would be different than other guns, drop at comb, straighter stock, etc.
Nitro proffing started in the 20's. on Smith guns
Pete, tell your friend to get a letter from Cody, indeed that would be a rare gun, especially in a 20 ga.