Book excerpt: This is the 2nd edition of a book about the history of the postal service in the Caucasus and the issue of the first rare postage stamp on the territory of the Russian Empire and Georgia in 1857. There are only a few copies of the Tiflis stamp. It is one of the rarest and most expensive stamps on the planet. The book will be useful to everyone who is interested in the history of Russia, Georgia, the Caucasus, collectors, philatelists.