The coin is a French 5 Francs coin minted in Paris (mint mark "A"). It weights 25 grams with a fineness of 0.900. This is the monetary standard of France from the Frech revolution until the End of WW1 (1918). It is also the standard of the Latin Monetary Union.http://en.wikipedia.org/wiki/Latin_Monetary_Union
Such 5Fr coins were minted in large numbers and curculated in all countries of the LMU freely until the First World War. Of course political systems changed and so the face design changed, but coins of former political systems were readily accepted. The coin here is well circulated. It must have run for a long time. At least a few decades. So I would not date the making of the box too early. Maybe around 1900, maybe even after 1918 when these coins were removed from circulation.
This as an attempt for dating the making of the box.
I see in your pictures the inside of the box has cupric acetate. And some letters and marks oxidized in it. What is this? Cand this help us dating the time of placing the box more precise?