Hey, I lived back in the day, and I'm proud of it. Keep asking. .45 ACP (automatic colt pistol) have been around since 1911, and 100 years later that cartridge is still going strong. In fact I've heard that some of our special forces are using that round over the 9mm. Being from back in the day, my short term memory leaves a bit to be desired, but I think I also heard the Marine Corps is considering going back to the .45. However, if you take that information and put a couple of dollars with it, you can probably get a cup of coffee at Starbucks. If the head stamp is eaten off your cartridge, my swag is it goes back to almost 1911.