Luke,
I am having problems uploading a scan, but John S. is trying to help me on the problem.
If the scan posts, this is a 1917 dated Navy with the acceptance marks stamped after the finish was applied. They show the "halo" effect, and the raised metal around the stamps can be felt. It puzzled me why the acceptance marks would be applied before the pistol was ready for final acceptance. On US military arms the final acceptance mark is the last thing applied to the weapon before it is shipped out.
(post edited by John S. to display the graphic)