1 1/2 frame size was only used on hammerless Parkers.
You can determine the frame size by measuring the exact distance between the firing pins but unless the barrel lug is stamped with the frame size there is no way of knowing the frame size for a orphaned set of barrels.
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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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