I've managed to acquire a copy of the 1925 Azerbaijan issue, specifically SC#25. I saw on Stampforgery that the original is bicolor, with a gray-violet and black color, while the forgery is entirely brownish-gray. However, when I looked at Solovyov's catalog, volume III, the photograph shows it not as bicolor but as completely brownish-gray, like the Stampforgery forgery…
