"...Crown/B and Crown/U are found on the breechblock and left receiver, Crown/G is added on the barrel. B is the overload test proof specified by the proof law of 1892; it also denotes a completely finished pistol. U represents the word Untersuchung (inspected). G is found only on the barrel, and represents the word Gezogen (rifled) (from Costanzo, p. 196).
118,35 is a bore diameter measurement in accordance with English proof laws of 1894. It is equivalent to 9mm, but measured as the number of lead balls of the stamped diameter which weigh a pound (ibid, p. 191)." (emphasis mine)
The foregoing from the profile of a BUG proofed 1908 Commercial (the complete profile can be found
at this link ).
172,28 applies to the same formula, but denotes .30 cal. instead of 9mm. Note the comma in the number. This is a European number and the comma has the same meaning as the decimal point in the US.
Any chance you can send me pertinent info for my survey?
--Dwight