There are many objects similar to coins and banknotes with one side in blank (unifaces) and other objects similar to coins with both sides in blank (planchet).
Numista has these objects:
- uniface
- planchet: blank planchet, blank token, flat disc, flan vierge…
Could be added a new category and tags:
- Physical features, or Physical characteristics
- Uniface
- Planchet
NOTE: There is an old suggestion to create a new type “blank planchet” below “Coins > Patterns” https://en.numista.com/forum/topic129526.html, and it was adopted in an intermediate proposal (not finally implemented) of the new type classification https://en.numista.com/forum/topic144308.html#p1151960
Also, the category
- Visual effects
- Hologram
- Latent image
- Micro inscriptions
- Photoluminescence
could be merged with this one.