I wouldn't trust an antique store if I am honest. I saw an 8 lb shot put ball labeled as a cannonball even with the huge stamped 8 on it at one of my stores. If the store is also saying that the kepi is civil war for $275, they clearly don't know. I believe the gorget is very much a pre civil war item, though in more modern times they were still used in Germany. You have to see the back of it but it almost looks like it's part of a peace flask