If it is clearly an RM under a crown, then we need to look into where this marking configuration on the lock was used, and if the initials R M correspond to a maker in either Spain or Naples or if other markings such as CC notes apply
It is notable that the crowned R on the butt is seen on Spanish/Neopolitan guns of this type in mid 18th c. so the RM on the lock is of course the question. Is the R on the butt indicative of a maker? In the Palomares compendium of Toledo swordsmiths the crown over a letter is seen often, but there are none with letter R so the butt mark is curious as well.
Where are the guys with gunmakers resources here?
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