According to the "Dimensions of Gun Barrels at Butt End" on page 47 of theSerialization book, 1 1/8" between firing pins is shared by both the 1 1/2 Frame and the 2 Frame.
Yours appears to be a 1 1/2 Frame with a poor "1/2" stamp.
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"I'm a Setter man.
Not because I think they're better than the other breeds,
but because I'm a romantic - stuck on tradition - and to me, a Setter just "belongs" in the grouse picture."
George King, "That's Ruff", 2010 - a timeless classic.
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