G, I cannot tell if it's a B or an R. as only the front edge of the letter is there. The top loop is nearly complete. The bottom is a slightly curved leg. The crown is complete. The crown proofs are followed by 5,4mm .These are stamped on the left flat of the chamber block. The bottom of the block is stamped (more heavily) 5,39 mm. Why would it have two different calibration stamps? The Crown B or R and the 5,4mm on either side of the crown U, are struck much more lightly. And in a different style.
Ron
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I Still Need DWM side plate #49... if anyone runs across a nice one.
What ~Rudyard Kipling~ said...
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