5″ Dutton Square Port Short Shank Curb

5″ Dutton square mouth curb bit with what Dutton calls teardrop shanks, that are very short at just 6″. Port is 1″ wide and 1.5″ tall. Rotates at the port and shanks. Nice, short shank using bit. In hardly used condition, shows only faint rusting, which is typical of iron bits. Stamped on the bottom of the shank (T37).