Warren Mass? That's a new clue too...Warren is 25 miles west of Worcester... R T Torkelson was in Hatfield Mass in 1891 when he got this semi-hammer(?) patent
http://patimg1.uspto.gov/.piw?Docid=0045...View+first+page

Notice how the rib extinsion in the Forehand catalog (repro year unknown) has a third fastener like the the rib extension in the Warren Mass catalog

The rib extension on the stockless Torkelson looks like the rib extension with a plain dolls head as in the patent drawing below (from 1898)

http://patimg1.uspto.gov/.piw?docid=US00...6RS=PN/0601,820

as does this gun #638, which was made before 1898 because it's stamped with the 91 patent date AND is stamped "Pat Applied For"...By the way this damastwist pre-98 Worcester Connecticut made gun has a Belgian mark and is also marked "JF" barrels...JF presumably for Jean Falla