Edward - the correct measurement to determine frame size and likely gauge possibilities is the exact distance between firing pin centers. Yours appears to be exactly 1-inch which makes it a 0-frame. 16's, 20's and early 28's were built on the 0-frame.
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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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