Pretty much anything that's been certified as genuine, this means coins, tokens, paper notes, stamps and even some artwork from the first couple of years.
The certifications will be very important as anything that goes up in value will eventually be copied/faked. Dated items will demand a premium as well as anything
first generation.
I agree. Also, The actual grade of the item will be more important at some point. The value of a MS62 1 Cas and a MS 66+ could be a big value difference.
Always the grade is important for market value on the coins and most definitely for the future. Hopefully the grading companies will continue to embrace these coins and expand their coin base for grading to make room for even some of the newer coin makers. We have started to see a lot of newcomers in recent years with new designs and styles. I can't wait to see what else is in store for this awesome niche space.