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I have a bracelet with the marks as shown. It has both Vienna mark A inside the dogs head mark for 1872-1922 and a solo A mark for Vienna 1867-1872. Am I safe to assume this piece crossed the change in assay marks and therefore dates to 1872? Thank you.

Yes because of the mark in front of the dog's nose. It dates the mark to 1872-1922. Unfortunately the mark to the left is unreadable. It would have told the maker.

Thank you. The bracelet is marked elsewhere for MuS, Markovitsch and Scheid.

I have done more research on the solo Vienna A mark. It was clearly used after 1872, at least as late as 1882 and probably after that. Even in conjuction with the dog mark and A mark inside the dogs head stamp.