Thank you so much for your contribution, Philip.
Thank you also for reminding that this patilha version is mentioned in Lavin's work, where i now notice that is actually illustrated with a sketch (fig. 17).
Although this 'infrequent' (his term) variant was confined to the XVIII century, this example of mine is of course a later specimen and, the interior mechanism that retracts the cocking studs when pulling the trigger, looks like a singular solution to me.
Indeed the design of the lock plate is typical of flintlocks; due to that, the first thing i did when i saw this gun was searching for traces of previous flintlock devices, but in fact the plate metal is intact; despite its 'suspicious' aspect, it was indeed born for percussion.
Best
Fernando
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