Bulgarian heavy ball, lot 38 loaded circa 1963. The Yellow stripe is for heavy ball, silver or no stripe is light ball. Copper washed steel case, sometimes brass case, sometimes even repackaged Chinese ammo. It's all corrosive, it all goes bang, and that heavy ball kicks like a mule! FYI...Not to be used in a PSL, you'll break it!Opening a can of Bulgarian can be a surprise, and the only sure way to find out whats inside. I had two identical cans like that, both yellow stripe. One had heavy ball, the other had heavy ball steel core that has a yellow tip, but silver painted on the point.If I recall, they were packed 800rnds to one of those tins. If I can get to the last two cans I have, I'll check the round count marking for you.