Mike,
Still (Imperial Lugers p.61) notes that "almost all" 1916 Erfurt have the rear sight receiver cut, but also notes that the dimensional tables were not amended until November of that year. This gun (no suffix) was made within the first 10,000 examples of an estimated 80,000-pistol run that year, so the lack of a sight cut is not particularly worrisome, unless someone comes up with statistics for early guns in that range with the cut.
The c/RC Revisions-Commission stamp means only that some part was sufficiently out-of-tolerance to go to a higher authority for acceptance. It does not indicate a rework of any sort.
There is no accounting for the overstamp on the breechblock. It might be useful to photograph it in different lighting conditions--direction, hi contrast vs. low, etc., to see if anything more can be drawn from it. It occurs to me to wonder, what is the firing pin serial number?
It appears that the front of the frame rails--both sides--are somewhat pitted. It is hard to tell from the phtots, are the pits blued to the bottom?
I wouldn't read anything into the magazine selection with this Luger. Its been 90 years, through the ownership of no-one can know how many people, and there is no accounting of what owner came up with what magazines to go along with it, whenever.
--Dwight
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