I can't help with the stamp ID (sorry!), but I would advise you to perhaps change your post title to include "German(y)", as we have a few Germany experts here, and the post title might catch their eye better Welcomt to the forum!
It begs the question as why both the overprint and the design are reversed unless it's a forgery and the guy that made the die forgot to carve it in reverse perhaps? Just a thought on it as I certainly am no expert...not by a long shot! It is pretty cool though and would make do a double take.
It must be a Prussian stamp. It is very similar to their 1861-1865 "Coat of Arms" stamps. Also, I came on accross on some Prussian stamps (numeral values from 1866) which have been printed in reverse (I don't know why), similar to this one you have.
However, I am pretty sure that, at least, you know the country of the origin now - it is Prussia, German States, similar design to the Scott #16.
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