Originally Posted by Matchlock
... I am always grateful for hints on new or old publications where 15th/16th century firearms are illustrated, especially from the RAM. Nobody is perfect, neither is my library ...
You probably have this one ... but just in case:
'A History of
SPANISH FIREARMS' by James D. Lavin (1965).
It contains various pieces made by the Marquarts, including the one you posted above, as well as from other smiths, as other specimens from the Real Armeria.
I bought an used copy, couple years ago; it's nice and rather comprehensive ... in my layman's perspective.