I have seen a reworked Swiss with a "FB" which was considered to be "Fluckiger Bern". I had hoped that was the mark on your gun, but from the photo it is definitely "RB" so I have no clue. I suspect that your assumption is correct that this is an approved standard marking for reworks (probably limited to guns intended to be sold in Switzerland) and bore the initial of the gunsmith and location of the rework.
I have a bunch of books on Swiss pistols, unfortunately not the one you reference. I have not found any rework information in my library other than FZ, but I will keep on looking. I feel certain that your RB mark is authentic and I hope you can find the source information.
Ron
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If it's made after 1918...it's a reproduction
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