Real vintage glass Czechoslovakia beads or restrung from the 1960’s how to tell Mardi Gras NOLA

I buy and sell vintage czech beads and there’s a lot of good ones and bad ones ,the last 15 years I have had to explain this to people on eBay probably a hundred times , so now I have the video when they ask I will just send them to my channel, should have done it years ago .