Perplexing Mark On Flintlock Holster Pistol

[fernando]

Originally Posted by corrado26

This is a Spanish cavalry pistol M 1781 (after Juan L. Calvo, Armamentos de Munición en las Fuerzas Armadas Espanolas). Cock with ringscrew and its upper lip are original and not from a miquelet pistol. Its sideplate is very characteristic.
corrado26

Good shot, Corrado. It must be the same pistol present in Calvó's other work, Armamento Español en la Guerra de la Independencia, page 37. Only that this time he doesn't call it 'M 1781' but 'dated 1781' ... with a lock model 1753 of the French style.
But what troubles me in the example posted by Dana is that stamp on the lock. No rational lockmaker or arsenal would stamp a mark in the inverted position. This certainly was stamped afterwards, assuming this pistol is original. Also the lettering doesn't seem to make much sense .