Hi Cerjak,
Sorry to see that nobody has responded so far.
My expertise in parts of armor is very limited, and my expert friend whom I linked with your query has not yet replied.
Telling from the surface condition and the visible criteria of manufacture, like the patina, washers etc., I would not doubt that this is an original Zischagge from the second half of the 17th c., probably of Polish origin.
Sadly I cannot answer your detailed questions with sufficient authority but I noticed a similar piece ending on ebay a couple of days ago, which my friend thought was a fake; I differed from his opinion and it fetched 1,100 euro.
Hoping this will be of at least some help,
best,
Michael
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