I have acquired a couple of 20mm Hispano Cases marked 1953 RG with SAPIR IZ around the rim next to the extractor groove. They both came with these repainted (I can see brush marks and it's pretty un-even) shiny red projectiles. I was trying to figure out if they actually are SAPI rounds, but after cracking one open it doesn't really look like any of the internal pictures I can find of any Hispano or Oerlikon projectiles. The projectile tip is marked JAP, and it has this aluminum rod that was clearly packed into some white substance. It has no other markings that I can see. Ideally I'd like to restore them to realistic colours if I can figure out what it is.