Odd .45ACP projectile

Sorry I have no picture(s) at this time.

Headstamp says simply “.45 ACP” and the projectile looks like a full metal jacket but has three ‘dimples’ that appear to go about a third of the way into the projectile. The box is labeled with what seems like a western European Slavic language.

Any ideas?

Purple primer seal?

dimples = bullet crimp?