whats so good about them is usually that ammo is lacquered steel case ammo , with a copper plated bullet on strippers from that maker, from those years. extreamly rare from what I can see that I got brass cases and cupra nickel bullet. im sure its out there but this is the only time I have actually seen it. this is or was made for the CZ sub gun I cant remember the name of it. the brass case ammo works way way better in my P762 pistol than the lacquered steel cases. so, I hit the lottery, I have 2 cases of 2500 rds ea, and im happy