Yes, multi-struck coins with more than 6 strikes do exist, although quite rare. However, extra strikes on those coins are usually very close to each other. The upcoming Heritage example is therefore a nice eye-candy piece.
Yep, I have bids in on all of them plus a few others. Can't wait to see what I get. Oh wait, this is April 7th isn't it?
I don't particularly collect error coins, but I'd go with the 1965 Quarter struck on the 90% silver planchet if I had to choose. I'd certainly love to have a coin that's been the subject of countless threads inspired by Youtube clickbait.