Well it seems that DocAV explains it quite well. I just checked and have one 10 round box but with no worth while marks. However, I also have three 20 round boxes two by DWM and one with I think with Spanish writing but not sure. As for price I would say around $100 for a 20 round box in reasonable condition. I haven't seen any at the gun shows in quite a few years, in the past if I ran across any I would buy it. At that time it was very expensive. I did shoot a couple of rounds of the original ammo and it was a great experiance, all that burning black power and smoke coming out the barrel. Anyhow, Domminion in Canada used to make it but now you have to buy the cases and bullits, reloading your own ammo.