Why have any stamp certified, on or off cover? JMO, if a stamp is worthy of certification off cover wouldn't it be just as, or even more so, worthy to be certified on cover?
IMO, there are several reasons to have a stamp certified, particularly when there are slight differences between them and another. Like A10 design, the 10, 10A, 11, 11A, 25, 25A where the perforation and the color are the major difference, they still follow the same A10 design. Then there are at least 15 different scott numbers for the 1 cent Ben Franklin. Counting imperf & perf varieties there are and the A5 design 5, 5A, 18 and the A6 design 6, 6b, 19, 19b, and the A7 design 7, 20 and the A8 design 8, 8A, 21, 22, and the A9 design 9, 23 and the A20 design 24 and I'm sure I missed some.
Most differences are, at best, hard to determine. The type, the plate, etc. I can figure out perf & imperf, unless someone cut off the perfs.
Some carry a huge difference in value as just the single stamp. Then if its on cover the value can take another jump. The 2011 Scotts for example; 5 single $85,000.00 then on cover $95,000.00 6 single $13,000.00 then on cover $17,500.00 7 single $160.00 then on cover $190.00 8 single $3,250.00 then on cover $3,500.00 9 single $120.00 then on cover $140.00 10 single $200.00 then on cover $275.00 11 single $15.00 then on cover $17.50
Me, I still cann't tell the difference between a #8 and #9, at least I'm uncertain. So, I'll pay the cert fee and then I'll know for sure. Using the same logic should hold true if its on cover or not.
Just my humble opinion...
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