"monnaie ancienne"
the Sou (alternate spelling 'sol') was an old French coin.
FRANC
A franc
Old French coins would be called Francs. now the currency of money there is called Eros, but very old French coins were called Francs. Singular is Franc. Plural is Francs.
The old French coin starting with the letter "E" is called the Écu. It was a silver coin used in France from the 13th to the 18th century.
It is an old French coin, from the 1940 to 1944 era.
In French, 'huguenot' was the name for protestants. There is no old French coin known as a 'huguenot' - but there is a 1924 US half-dollar called 'Hugenot-Walloon tercentenary'. (follow link)
ecu
écu
sou, ecu
Just looking at the coin carefully will help. The name of the country might not be in English. For example, a French coin will say Republique Francaise on it, and a Swiss coin will say Confederatio Helvetica. A good coin book will help find the answer.
How to say " I am young not old," in French. "Je suis jeune pas vieux."