Question About Esperanto And Currency

Mi kolectas monerojn. I havas neniun el tiuj.

Krause lists these "coins" in the Unusual World Coins book, filed under "Esperanto Foundation". There are three series listed:
- the 1912 spesmilo series, comprising silver 1 and 2 spesmiloj coins, struck by the Holy Freres mint in Switzerland.
- the 1959 stelo series, comprising base-metal 1, 5 and 10 steloj coins, struck by the Utrecht mint, Netherlands. Here's the 1 stelo.
- a 1965 silver 25 steloj coin, also struck in Utrecht.

These are all privately-made, non-circulating, non-legal-tender "coins", not issued or backed by any government. If the foundation issuing them used them as money, it was purely as an internal token. More likely they were simply sold as fundraisers. According to Wikipedia, the earlier coupons saw use as an internal token but by the time the coins were actually made, enthusiasm to actually "use" them as money had waned.

The 1990 Cuban commemorative peso, with a mintage of only 6,000 can hardly be considered a "circulating coin". They were presumably sold as souvenirs at the conference.

So, I think the answer to the question implied by your first sentence is, unfortunately for fans of Esperanto, "Such a coin does not yet exist".