The Zurich angster coins of the 17th Century are bracteates--the reverse image is a mirror image of the obverse. The photographs in the Numista listing are of two varieties of the coin--the triangle is in the upper right quadrant of both photos; this is not possible.
Also, one has crescent moons at the sides of the shield; the other has rosettes.
https://en.numista.com/catalogue/pieces33772.html
Here is another example, with weak rosettes beside the shield:
http://www.elfreeman2.com/t18/4v61o.jpg
http://www.elfreeman2.com/t18/4v61r.jpg
You may use the photos if you wish; please credit them to elfreeman (my eBay username).