A comparative study of the postal issues of the USSR and the participating countries Interkosmos was a Soviet international space programme that allowed the Warsaw Pact countries, later the other members of Comecon and further states, to take part in space mis...

Why the postage stamp and artificial intelligence have more in common than it seems. A postage stamp is a small picture bound by very strict rules. It is almost always rectangular, and it always carries an inscription, a price and a year. Those very rules are ...

The study of early Bulgarian postal issues from the 19th century represents a key element of modern philatelic expertise. The present research was conducted at the Central Research Laboratory (CRL) of the “University of Chemical Technology and Metallurgy” and ...

The artistic sweep and multifaceted nature of Professor Alexander Poplilov-his scale, pedagogical charisma, and verbal charm-are recognized as the brightest rays in his creative aura. They shine most strongly upon his achievements in political poster art, pain...

One of the most authoritative Western studies on the forgeries of Bulgarian postage stamps was published by Otto E. Stiedl and Fritz Billig as the 34th installment of their series Expert: Billig's Großes Handbuch der Fälschungen (“Billig’s Great Handbook of Fo...

The research conducted by Ivan Metchev on the so called “Sofia” issues is undoubtedly one of the most extensive and in depth studies on the subject in recent years. It brings together a large volume of visual comparisons, observations on clichés, statistical d...

A few decades ago, philatelists did not face many of the problems that are now completely common. In the past, the main interest was in used (cancelled) stamps, and the requirements for mint stamps were minimal. The issue of missing or damaged gum was almost n...

Today I will present you with a small study on the mini-sheet "For Security and Cooperation in Europe - Madrid 1980" (BK 2931), conducted on 116 issues of the edition. The examined sheets include both the first printing (from number 1 to number 40,000) and the...