Bill: Jason went through this with his Eagle, and it is likely, but clearly not certain, that after introduction of the Double Barrel Trap gun in 1920, the 'T' indicated the 'Trap Package' which included a beavertail Schnabel forend with the reinforced barrel lug, Automatic Ejectors, Hunter One-Trigger, standard recoil pad, and two ivory sights. Here's a lug stamped 'T'