Ah, the Spanish peseta (should be rotated 90° ccw) and the Dutch "dubbeltje" (10 cent coin) I have too. The latter was - in Cu-Ni and a different design but with that diameter - in use until the end of 2001.
In the early 20c (roughly between 1880 and 1940) the Netherlands also had a copper half cent with a diameter of 14 mm. And the silver 5 cent coin was 15 mm until 1850; afterwards they used a somewhat smaller version (12.5 mm) until about 1900.
By diameter: U.S Type I $1 gold
By original issue weight: U.S. 90% three-cent piece
By original issue buying power: Either a modern Canadian 1-cent piece or a Maltese 1/3rd of a farthing.
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