[WildHighlander57]

Good point!

But could it be put on the surface and bonded to it?

Easily dug out though.

[LonePalm]

When you put an RFID chip on something to track it you generally want to put it where it won't be seen. You would still have to get the reader to o.5 and 2 meters from the chip depending on the material it is applied to.

Putting it on the surface would obviate that. It is easy enough to change RFID chips. It would greatly reduce the visual appeal for displayed coins.

WWG1WGA

Garde la Foi, mes amis! Nous nous sommes les sauveurs de la République! Maintenant et Toujours!
(Keep the Faith, my friends! We are the saviors of the Republic! Now and Forever!)
LonePalm, le Républicain du verre cassé (The Broken Glass Republican)