According to Csaba Kohalmi in the The News of Hungarian Philately (v44n1), these overprints are all bogus. Kohalmi believes they were made by a Vienna stamp dealer, but name is not given.

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They are known on 2 sets, and have also been seen on a postage due, all bogus.

 
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Hello,

these bogus are well known and made by Stolow

Stolow The brothers Henry (1901–71) and Julius, originally from Riga, were stamp dealers in Berlin 1920s to 1933, after which they moved to Brussels for a few years, before emigrating to the USA. In New York they (mainly Henry) were famous as stamp auctioneers and wholesale dealers. The company was also engaged in e.g. bogus overprinting on WW2 stamps (FFE7 p. 58), the 1945 Greenland overprints, Maluku Selatan phantoms and new issues for African republics. Some time after the war Henry returned to Germany. The Henry Stolow company's shop in Munich was still active in 2014 at the old premises, but is owned by Rolf Müller. Gregory Stolow (USA) is son of Julius

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