TBA-0015 · Archive record
Casascius
25 Bitcoin
A large gold-plated 25-bitcoin piece announced by Mike Caldwell in October 2011. The denomination is part of the object design; each specimen requires its own hologram and funding identification.
Documented details
- Maker / brand
- Casascius
- Object type
- Coin
- Mint / inscription year
- 2011
- Material
- Gold-plated alloy
- Purity / composition
- Gold plating; alloy fineness not specified
- Denomination
- 25 BTC
- Weight
- Approx. 34 g (maker announcement)
- Diameter / dimensions
- Approx. 45 mm (maker announcement)
- Original funding arrangement
- Wallet collectible
Not established or not applicable
Issuing country, Issuer, Producer, Seller, Release year, Offer year, Thickness, Edition / mintage, Finish / variant.
Identification notes
Maker launch measurements are approximate. Some auction catalogues report 44.5 mm and a different weight; those specimen measurements are not silently substituted for the launch specification.
A dated 2011 25 BTC example. This obverse photograph does not establish the reverse hologram variant or funding status. An additional oblique photograph shows two 2011 25 BTC pieces and their edge profile. The reverse holograms are not visible.
Sources
- Source documentation ↗
- Collector reference · secondary evidence ↗
- Gage Skidmore · licensed reference photograph ↗
- Casascius / Mike Caldwell · 25 BTC launch, October 2011 ↗
Record reviewed: 2026-10-12.
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