Hello and happy new year!
I have two french 5 francs coins, one is 1875 with a weight of 17.7 grams and has a reeded edge. The other is 1876 and a weight of 25 grams and has a smooth edge with wording. According to the Numista catalogue there is no variation in the edge. The one with lower weight is silver as is the other. Are both genuine or is one fake?