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Collectors of Transcaucasia 1917 - 1923 will occasionally find the handstamp A.REVEST on the backs of stamps. From Googling, I found only that A. Revest was a member of Rossica in the 1950s and living in France. He had stamps of Transcaucasia for sale.
I bought the above cover as a nice example of a 10 rouble Registered franking from 1920. Sent from Kharkiv to Baku in June 1920, it has a pair of perforated 3r50 stamps used at face value and an imperforate 3 kopeck (with Kharkiv type 1 Trident) revalued x 100.
I looked at the front and noticed the name "Revest" at the bottom and I translate the first name and patronymic as "August Augustovich". If I am right, then this is most likely to be the A.REVEST of the handstamps, living in Baku in 1920.