This topic came up and was addressed in the “previous” forum.
The green or blue green lacquer applied to the primer in the photo above designates a Type 92 which is a semi-rimmed cartridge. The green lacquer was used on Type 92 primers for ball, AP, and tracer loadings and appeared sometime between 1938 and 1941.
Elks speculated that the green lacquer would distinguish the Type 92 from the newer Type 99 which was rimless and introduced in 1939. The reason this was important was because the Type 99 (rimless) ammunition could function correctly in a Type 92 machine gun, but the Type 92 (semi-rimmed) would not function correctly in the Type 99 machine gun. This also explains why the Type 92 ceased to appear from about 1943. Since the Type 92 first appeared in 1932, there was a period of approximately 6 years where the Type 92 did not have the green lacquer primer. Therefore, the Type 92 could have an unmarked primer or a green lacquered primer, but the lack of the green lacquer would not disqualify a cartridge from being an earlier Type 92.
The Type 92 ball did use a 203 grain GM boat-tailed bullet. The Type 92 was made in ball, AP, tracer, blanks, de-coppering, high-pressure test, dummy, and armourer’s dummy.
I agree with JJE in that both cartridges in the photo above are Type 92, with the non-lacquered primer cartridge pre-dating 1938.
Hope this doesn’t add any confusion.