Yes, some time ago we had several opinions about the "face". Interesting things do show up in engraving in this period. I love the dragons, gargoyles , and faces of various, I hope, imaginary types. I have thought the face might be Lucifer creating those interesting fire motifs around the pinfire pin holes in the top of the breech. Whatever, or whoever, it is, it is surely fun. I'll bet the engraver enjoyed creating it.

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