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Double perf on 2d Pictorials

Posted: Fri Nov 27, 2015 7:40 am
by Postagedues
The stamps below show double perfs, one with 11 on all sides and the double, the other with the perfs all round being 12½ and the double perf being 11.

Is there a difference in the production process that created these varieties (I suspect the 11 al round was an immediate reperforation, the compound a later repair). What is the relative scarcity of these perf varieties?