Hi Tim, Reading from the left, the receiver marks are: 1/ Pentagon shaped crown, this shows that the pistol has passed a proof test. This same mark should be on the left of the barrel and on the top right corner of the left side of the breech-block. 2 & 3/ Three lobed crown over M. These are Naval inspection marks and there should be another of these beneath the barrel, above the serial number. Your gun is one of the last to have the three lobed crown/M mark. It was replaced by a pentagon crown/M at about serial #3500a. Regards, Norm
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