The Argentina-based bhCoins have come out with their first series of DIY coins. Although they contain no precious metals, they are available in mirror and antique finishes in both gold and silver.
I opted for the shiny gold and shiny silver, and they look fantastic. They have a nice weight to them, and a compact size at 28mm in diameter.
Each coin kit comes with 3 holograms for securing the key in the square hollow on the reverse of the coin, and also a hologram-sealed envelope containing a set of address/key pairs, the keys being printed at the right size to fold and place in the hollow on the coin. For added security, one could always generate and print their own keys.
I am really fond of the bhCoins designs. They’re simple and elegant, but unique at the same time, not quite like anything else out there. These have a funky “B” all askew and slanted, sliding right off the surface of the coin, and the mirror finish is top-notch.
And they’re a bit on the obscure side, which is always exciting for a collector. For the curious, there is more information here.