I've seen "second issue" bandied about in several places. One author, in a source I can't cite right now, noted that there was no "second issue", but that the First Issue pistols with serial numbers added on the left chamber and exposed surfaces came about when these pistols came in for armory attention during their service life post-1910, and the marks were added to bring them into accordance with the 1910 marking regulations.
--Dwight
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