Are the premiums for larger Casascius coins similar to the premiums for 1 BTC Casascius coins, or are they larger?
Also, how often do the series 1 error coins show up? What kinds of premiums do they command? I've never seen one, but I'm sure they pop up from time to time.
I don't have any of these coins, but I'm still very curious.
Depends. not so much premium here, and seems the risk is higher in denom as the btc amount goes up, so here is probably a better bet as buyer, but maybe check for after-market/other if not wanting to deal here:
https://stacksbowers.com/cryptocurrency/bitcoin-btc/
That's a great site. Thanks!