Hi, I ask for clarification on this type of perforation, for what use it was issued, and if possible to know the reason for those strokes of red lines on the back of the stamp.
go to Don's first link. if you scroll towards the bottom of the article, you'll see the various private perforators all listed and examples of those peforations. They are listed alphabetically, so Shermack comes near the end.
The various Shermack types are easily discernable, and Type III especially so. That is the type you posted. It is also the most commonly found of all the Shermacks. There's usually a slight premium for a stamp, and a large premium for on-cover usage.
and, Don, thanks for putting up those great links.
David
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Hi, I ask for clarification on this type of perforation, for what use it was issued, and if possible to know the reason for those strokes of red lines on the back of the stamp.
