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). 172,28 is a bore diameter measurement in accordance with English proof laws of 1894. It is equivalent to .30, but measured as the number of lead balls of the stamped diameter which weigh a pound. Its the same system from which we get our
shotgun "gage".
The c/N next to your recoil lug is an odd one. There's no doubt that it has nothing to do with proof marking. Frankly, if workers' marks had any system going for them, nobody knows about it nowadays. Sorry that thats not more satisfying.
Marbles and Shearers front sights are seen sometimes as aftermarket replacements in the US, they were not assembled onto the gun as original equipment. Thats a pretty nice example of a 1906 American Eagle, I don't have any argument with the value Pete put on it. The Marbles front sight will not materially detract from its value.
--Dwight
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