Fascinating to learn to look at all parts and sides of a stamp and not just concentrate on one side to determine any possible changes made.
Regarding the OS perfins, has any study been made regarding any different dies of the OS perfin, if there are any? Similar to the Canadian OHMS perfins?
From Ken Pugh's web site about OHMS (and other fakes and forgeries):
Quote:
For the last twenty-nine years, confidence in buying O.H.M.S. perforated official issues was virtually destroyed. Fakes were reported in abundance, and very few collectors, dealers, and expert committees could accurately identify all the genuine types. Release 5 is the only comprehensive reference available to experts and general collectors that will enable one to identify all 25 genuine perforated O.H.M.S. dies as well as the genuine O.H.M.S. and “G” overprints. It starts with a 20 page section on detection techniques followed by large scale photographs of all the 5 dies for the 5-hole and 20 dies for the 4-hole perforations.
http://www.kenpugh.ca/PhilatelicSeriesII.aspxI would think a well regarded study into what is and what is not faked and how to tell the difference, would be invaluable to collectors.