VIntage Five Franc Coin Lighter

Cigarette lighter in the form of a five franc coin, with "Empereur Napoleno III' on one side and "Empire Francais 1870" on the other side. This item was made in Japan I would assume for the tourist market. I bought it in a small flea market just outside of St Tropez and it looks to be in good condition (the flint sparks) but I have never tried to light it. It measures 37mm in diameter.