Hi Peter. You need to quit counting perforations - it does not mean a thing. You should gauge them with a perforation gauge. When a stamp has a perf of 10 that means it has 10 perforations per 2 centimeters. And a high value is not usually dependent on the perforations alone - other factors are important.
This stamp is perforated 11 all around, not perforated 10 on any side. As mentioned, the perforation is gauged by how many perforations are in a 2cm length, NOT how many perforations you can count on a side.
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