2011 Casascius 1 BTC Brass Coin - Series 2


These coins arrived only two months after the first Series. It brought one very useful innovation: The hologram had a small plastic window displaying the first-bits and private key inside. This made it impossible to change the private bits on the hologram.
Supplier Casascius
Release Date 06/11/2011
Country of Origin United States
Item Type Coin
Denomination 1.000 BTC (Bitcoin)
Mintage Quantity 1644
Base Material Brass
Diameter 28.50mm
Depth 1.50mm
Weight 6.80g
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