A Metal Not Included in Catalog

Greetings,
The Metal " Antimony " is missing in the Catalog
It was first used in Guizhou, China 10 Cents Coin of 1931
Link : https://en.wikipedia.org/wiki/Coinage_metals#:~:text=Antimony,medallion%20medal%20alloy

I believe if antimony was used for one coin in 1931 it would have been a minor alloying element. Can you give an example of a coin where antimony is a major constituent?

Other (Antimony) is sufficient for such a fringe case.

I agree with adding Antimony as a selectable composition, and I do having a pending request to make that happen (pending for over a year now, along with a bunch of other composition requests). With it being a periodic element, it cannot really be grouped in anything other than "other", and I think it would be nice to expand our "other" compositions. There may have only been one (standard circulating) coin made of this composition, but... a collector might not ever know that unless it was an option to select.

For reference, here is the coin in question:
https://en.numista.com/catalogue/pieces42344.html

And here is an antimony pattern as well:
https://en.numista.com/catalogue/pieces296768.html