I've had a look through those two books for any useful information and cannot find an RM or PM.
There is however a crown over R stamped on the butt of a Spanish (or Neapolitan) swivel gun . There is no other information - apart from an indication placing it mid 18th century - and the photograph is small and grainy. Unfortunately the stamp is not visible.
No use for this thread - but I came across the observation that the pineapple motif often found on the front finials of trigger guards was introduced to honour Capt Cook and rapidly replaced the acorn after his death in 1779. A handy date line for English guns.
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