That's what I thought I saw. The hammer marking from working the tail plates lengthwise is visible as well as those inside the bowl from planishing. The somewhat raggedy edges of the inside rolled plate edges is also pretty common on munitions armour of this period. The stamp on the brim is in all likelihood an armoury or city control mark. Construtionally this shows the hammer marking for how these would have been made in period, my feeling is that this is a good 17th c. zischagge.
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