I have a small lineup of cartridges that come from a small plastic clamshell case that seem to have been set aside because they are special. The only one I know for sure is the plastic Hush Puppy chamber plug in the center, and that this type is the typically encountered variation for this sort of plug.
If you can’t read the headstamps they are, from L to R:
- SEL 91
- 539 ^ D ^ (I think it is a “D” symbol at bottom?)
- 21 78
- ELEY 9.P
- 21 81
- P.0-1-83 9mm
I presume the one with the spring is some sort of snap cap, and it, like the steel case with white projectile load, and the aluminum case CCI load are 9x18mm, while the light blue plastic load is .380 auto. The 7.62x25 with purple tip has “HPT” written on the side to suggest it is a high pressure test. I don’t know what might be special about the Eley 9x19.