Russian, Post Office, Sevastopol

Russian, Post Office, Sevastopol, Image & Found by Christoph Krückl.
Found in Vienna, 25×25mm.

... / (СЕВ)АСТОП / (ПО)ЧТОВОЙ / (КОН)ТОРЫ // blank

Tentatively identified by Tanya Flow as a Post Office Seal from Sevastopol.