A thread dedicated to the discussion of collecting stamps, coins, weapons, military awards, etcDo not buy items from sellers on eBay if they do not have an excellent reputation. On the web-site you can find copies of coins and badges that cost $10 each but people sell them as originals, so you are not safe even when buying cheap items. There are also web 1.0 style forums for professional collectors and dealers, like this one
https://www.wehrmacht-awards.com/forums/they are quite good and many people on them have decades of experience in collecting. These forums function like auctions and they are also very useful if you want to find out for free if your jewelry/coin/whatever is fake, or just take a look at people's collections.