F2 copies
The Nikon F2 was and still is the best mechanical 35mm SLR ever made, and little surprise it was copied by the Chinese and Russians. The Almaz 102, 103 & 104 and Pearl River S-201 are crude copies, and they are not compatible with the Nikon F2. These cameras feel and smell rough.
The fairly rare (less than 10000 made) Almaz 103 has no meter in the prism, unlike the Almaz 102 and 104. The latter two are very rare (less than 100 made). Pearl River S-201