The expert mark appears to be that of
Jan Mrňák (1903 - 1968). See
http://www.filatelia.fi/experts/areasa.html or
http://www.phstamps.com/ . With the latter link, open
Marks and experts: Expert marks and signatures; Experts, Historic part.Shifted overprints with this issue have always commanded higher prices. E.g. in
Speciální katalog známek Československa, Protektorátu a Slovenského štátu by
Ladislav Novotný, Bratislava, 1949, this stamp with the overprint in standard position was quoted at 1 Kčs. The quotation for that with a shifted overprint was 100 Kčs.
Consider some offers ranging from up to 5 Kč for this stamp with the overprint in standard position to about 17 times that sum for a shifted overprint (
http://aukro.cz/slovaquie-slovakia-...-retargeting ) and even 28 times for a more pronounced shift (
http://aukro.cz/slovaquie-slovakia-...-retargeting ).
Posted 07/19/2016 12:15 pm
