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The "U crown" and "G crown" and 118/35 are German proof marks. The 118/35 is the original plug gauge measurement of the bore stated in bore gauge - 118.35 gauge.
I don't have my proof reference books in front of me now, so I am not able to be more specific.

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Pre-1905 Suhl proofs as there is no distinction between bp and Nitro. The queer gauge numbers were taken over from the British proof tables. 118.35 stood for a bore/ land diameter from .340” to .350”.

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