If Mike Caldwell would do the run, as some people have suggested, that would be even more exciting as some sort of closing the loop from the first physicals.
To avoid counterfeits maybe a metal stamping (or laser engraving) machine could individually engrave a derivation of a user supplied public key so that an index of all originally issued coins can be published. Way better than a hologram unless someone intends to also store BTC on it (which I don't think is the point in this case).
Will keep on watching this thread
![Smiley](https://bitcointalk.org/Smileys/default/smiley.gif)
P.S.: Also it would be a good idea to make it from Silver. It's not like that would make it much more expensive to produce.
P.S.2: Titanium would also be great and it would in some way "show" the evolution from classic PM's to a more advanced store of value as Bitcoin represents. I think it is harder to manufacture (proof of work lol) though. Not sure... what do the experts say?