Token, Apparently French

That thing is very nice find that one is for sale for almost 290 dollars right?

I think it is a 19th century token for a brothel : maison close or bordel in Franch . It was most of time managed by a woman : Madame Ernest and was situated at the first floor , where often was a piano room in the bigger houses . Looking the asked price , maybe the house still exists....albert

Um, no. France follows the British usage and so 1st Floor is what Americans call the 2nd floor.

After a little research, it seems that piano does not refer to a pianoforte. It simply means that it is the principal room of the house situated one floor up from the street. Not heard this usage in French before but it probably derives from the Italian piano nobile:
https://en.wikipedia.org/wiki/Piano_nobile

Rochefort sur Mer is a port town and was a base for the French Navy. It was also accustomed to seeing American GIs in WWI. There is little doubt as to the nature of Madame Ernest's occupation as Rue du Port and the roads around it, Rue des Mousses, Rue Toufaire were known for offering these services. Indeed the last of the old time maisons closes, La Bohème, only closed its doors in 2010.