I hate to jump in on your topic, but I didn't want to create a whole other thread for this question:
Does anyone know how much a 0.5 normal (copper) Casascius 2013 bitcoin goes for?
Thanks
monbux, I sold a 2013 Cas brass 0.5 ungraded recently for .75.
eliante, I will be happy to make an offer on your 0.5 silver Cas if you post some nice photos and a bit about its condition.
Thanks!