Interested..put it up for auction
Yup I echo that. If it was a private key version and still loaded, you would have got a decent premium on that. Though of all the Titan coins, the 0.5 BTC Brass and Silver have the highest premium of the entire range. I do love those Lions on the halves.
Stick it up for auction dude, but don't be too optimistic on price. I think you'll be lucky to get 0.05 BTC for it without a certificate and being redeemed.
Good luck with your sale.