Matchlock Estimate:
Perhaps the cubrecazoleta (pan-cover) cover. your cam and spring were attached to the box (stock) as the mainspring. Now that I'm looking more closely, I think the bronze plaque under and behind this key (lock) is the sure shot, which acts through a square button (decorated with lines)
Affectionately. Fernando K.
P. S. Why have you signed your mail as "Fan" (Fan)?. You're not a fan .......
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