So if I have a coin that is listed on Numista without weight or diameter (or both) can I measure my own coin and have the measurements listed on Numista?
Yes, it's not ideal to have data from a single specimen (especially for older coins) but better then nothing, preferably from high grade coins.
Numista actually asks you specifically for just that.
https://en.numista.com/catalogue/contributions/suggestions.php
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