so far all of the 2011 1BTC series-2 i've seen for sale are not graded.
have not seen a 45 o.5 silver for sale/auction for a long time already, i remb the last auction was also listed by you. Great to see them back on sale.
I had an MS64 2011 s2, sold it a few months ago.
The last series-2 silver half auctioned for only 10btc -- I won't auction another. Too great of a chance that interested buyers won't see the auction before it ends. Whoever bid on that auction but didn't win missed their chance to pick one of these up for sub-20.
I've got a sale thread somewhere asking 25btc for it. Given how well I take care of my coins (Blazed can attest to this, I sold him the best brass halfs that anyone's seen), I don't think that's an unfair price. I'd be willing to take a few btc off the price if the purchaser didn't want PGP custody docs.