If you like the Pistrucci medal, here are some pics you might enjoy. These are negative-image (incuse and reversed) electro-somethings of the Pistrucci Waterloo medal.

These are the correct size, with the medal part measuring about 5.5 inches in diameter, and a total diameter of about 6.5 inches including the broad rim. The rim and the backside of each half are covered in some sort of fairly hard waxy substance.

I've shown these to several people, and nobody seems to know what to make of them. I've had several guesses that are generally plausible, but nothing that I feel is quite right (in particular, the presence of the wax seems like it ought to be important, and none of the guesses can explain it.)

I've found several sale records of positive-image cliches (including sets that were produced by the Waterloo Committee in 1969), but nothing for negatives. Another mystery...