Thanks so much for your advice & comments. I’m starting to think that RCM coins are really not a good investment!

Not being at all experienced in coin selling, I have a 2016 $300 1 oz platinum Grizzly Bear: The Struggle coin, 63/200. What is the best platform to use? Ebay? Auction house? Best auction house/time of year to sell? I can only find 2 sold previously online, both in the USA, $3750 and $7500 USD. So a...