I see. Just for example in old russian catalog of Vietnam we have circulation for some of imperforated issues. I suppose digits were taken from Yvert. New Michel and especially Scott don’t know anything about circulation. And I assume that maybe SPECIMEN issues are 2-10 times less than imperforated.
Yes, i'm interested in SPECIMEN stamps.
And i know, that not all issues have imperforated variant.
And thanks for link to catalog!
P/S. Maybe someone here related to Stamp Company can answer?