The very earliest lifters often did not have the frame size on the lug.
However, the frame size can be determined by measuring the exact distance between firing pin centers.
Frame sizes are discussed at length in The Parker Story.
I wonder if the subject gun is chambered to take the 10B shell, given the serial number is preceded with a B.
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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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