Bitcoin in physical, collectible form sold by Heritage
In its Nov. 3 auction of the Otoh Collection of Physical Cryptocurrency, Part I, Heritage Auctions sold 250 lots of Casascius Coins, brass tokens denominated in Bitcoins, for nearly $7.2 million.
Mike Caldwell Numismatic Guaranty Co Otoh Collection Physical Cryptocurrency Casascius Coins Mint State
Source: coinworld.com