Ghetto, 20 marks 1943, aluminum, most dangerous counterfeit, 1970s

Counterfeit minted to the detriment of collectors.
Excellent detail of the original, including engraved "cracks" of the stamp - on the obverse under the date, on the reverse under the letter R in the word "MARK".
The most dangerous forgery, in GDA classification stamps F6/F6, in Bulkiewicz classification type VI.
An old forgery, now about 50 years old, collected by collectors similarly to Majnert forgeries.