Stack's Bowers Galleries announced the upcoming June 18 auction of a Casascius physical bitcoin token that has received a PCGS grade of MS‑66, marking a notable event for crypto collectors and investors.
Grading and Rarity
The Professional Coin Grading Service assigned the token an MS‑66 rating, a grade shared by only fifteen known specimens. Eleven Casascius coins have achieved a finer MS‑67 grade, underscoring the token's scarcity within the high‑grade market segment. The piece remains funded, retaining the original 0.5 BTC that was embedded on the blockchain at minting, a feature that enhances its intrinsic price for collectors.
Production Background
Mike Caldwell, a software engineer based in Utah, launched the Casascius series in 2011, embedding a private key beneath a tamper‑evident hologram on each physical coin. The design ensured that the loaded bitcoin could be