[Austin W Hogan]

Richard; TI4,TI5 and TI6 were the common fluid steel barrels for C,B,and A grade prior to around s/n 130000 when Acme became dominant.
There are few 20 ga exposed hammer guns but fewer appear in the record. Many exposed hammer guns are entered as hammerless; I have a 104000 lifter that is not identified as a lifter, and the big 32 inch hammer 12 that I brought to the "waterfowl' display at the annual meeting is stamped "PH" on the frame.

Best, Austin