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Unattributed Countermarks

Countermarks seem to be coming increasingly into vogue, as collectors demonstrate more and more appreciation for a coin's circulation history, but there are still countless marks of completely unknown origin. These could be the name of a merchant, an unattributed counterstamp of a foreign government, or a simple punch with no significance beyond someone striking it out of boredom. If you've got some unusual countermarks with an unclear history, let's see them - maybe somebody here will have some insight!
The coin I'd like to share is this 1853-P 50c, the mark seems to deliberately placed and of too uniform a design to serve no purpose, but the design is a complete mystery to me.
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Any images of the reverse of this one?
Also one's attention is drawn away from the pmd. IMO. Peace Roy
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Counterstamp on Venetian Ducat. I believe it comes from the Middle East, which makes sense given Venice's history as a seafaring and trading city-state. I'd love to learn more about it.

Complete Set of Chopmarked Trade Dollars
Carson City Silver Dollars Complete 1870-1893http://www.pcgs.com/setregistry/showcase.aspx?sc=2722"
Thanks for posting the reverse. I'm still wondering if it's a counterstamp or a one-off punching/chiseling and engraving.
All counterstamps are PMD.