45 Auto Chinese 90th Arsenal


#1

Hello.
Part of my meagre Chinese 45 Auto collection contains these five cartridges shown below, all headstamped with the 90th Arsenal symbol. All five show a 37 headstamp, which from the info about Chinese ammo, indicates they were manufactured in 1948 (1911 + 37). I have found that there is quite a variation between these five rounds within this year from February to October. A summary of these five is given below. My main question to you all is do the Chinese-made 45 Auto cartridges show such a great variety even within such a narrow time frame (ie. Feb to October 1948)? For example, I have two cartridges both h/s “ 2 37”; one with green case mouth seal and green primer (#320) and the other does not (#321). Another example, cartridges #320, 321 and 323 have bullets that attract a magnet yet #323 and 324 do not. Also cartridges #322 and 323 show what maybe a very poor type of ringed-in primer. Any thoughts are welcome. Thank you. (I am still fiddling with my scanner to get the best h/s scans, but I think these images show what I am talking about reasonably OK).

Cartridge #320
H/s: 2 .45 37 (Feb 1948)
Bullet: FMJ, magnetic (GMCS?)
Green primer lacquer
Green case mouth seal
Light headstamp, little difficult to read
Cartridge Weight: approx. 328 grains

Cartridge #321
H/s: 2 .45 37 (Feb 1948)
Bullet: FMJ, magnetic (GMCS?)
Clear primer lacquer
No case mouth seal
Same h/s as #1 above
Cartridge Weight: approx. 328 grains

Cartridge #322
H/s: 3 .45 37 (March 1948)
Bullet: FMJ, magnetic (GMCS?)
Clear primer lacquer
No case mouth seal
Ringed-in primer?
Cartridge Weight: approx.330 grains

Cartridge #323
H/s: 7 .45 37 (July 1948)
Bullet: FMJ, NOT magnetic (GM?)
No clear primer lacquer
No case mouth seal
Ringed-in primer? Very faint ring
Cartridge Weight: approx.328 grains

Cartridge #324
H/s: 10 .45 37 (October 1948)
Bullet: FMJ, NOT magnetic (GM?)
No clear primer lacquer
No case mouth seal
Cartridge Weight: approx.320 grains