Not really sure what to ask for this price wise as they are incredibly rare!
From the encyclopedia"These coins were given out to the press as gifts. They
are different than typical 0.5 BTC Brass coins in that
they have no public or private key, but instead display
a repeating “VOID” in the window. These were shown
in the movie The Rise and Rise of Bitcoin and were
custom made in order not to compromise the private
keys while these coins were being assembled on screen.
While it is uncertain how many of these were created,
it is estimated that roughly 12 were made and given
to the press. It is unknown how many survive today
as these may well have been discarded by unknowing
recipients who were not collectors, especially
considering that these coins contained no bitcoin."
I know of 3 others total and that is it... If I do not get an amazing offer this coin can go back into the vault for years