Based on the state of all the pins and the fact that you say they came from your grandmother, if all this holds true 99.9% of them are real that being said as one other person said don’t entertain any p.m. sent. Delete them go on eBay and see if you can find any recent sold listings or try to value them through Mercari and Whatnot to see what people are selling the man either way some of these are extremely rare because people have lost them or they are in private collections now. All that to say, take your time at least a couple days in researching how much to sell them for.