S2 1 BTC 2011

Manufacturer: Casascius
Year: 2011
Denomination: 1 BTC
Type: PF

Material: Brass
Diameter: 28.5 mm
Thickness: 1.5 mm
Weight: 6.8 g
Country: USA
Best Grade: MS-66


Appearing only two months after the Series 1 coins, Series 2 was a significant innovation. This new version utilizes a hologram with a small window to prove the presence of the first-bits and private key inside, making it impossible to rub the first-bits off and fraudulently print a new public key onto the hologram. It is worth taking note that these coins are in fact much more rare then the Series 1 1 BTC ‘Error Coin’.

*Numbers refer to series 2 1 BTC 2011 coins funded in 2011. There may be a small additional number that were funded in 2012 and are counted in the series 2 1 BTC 2012 numbers.