Martin sold his toy factory to Georges Flersheim on January 1, 1912 but in October of that year the horse, carriages etc. were offered for sale.
Were they still Fernand Martin’s at that time ? or did Georges Flersheim sell them, under the name F.M., because he probably switched to using motorized transport
At that time, Martin already lived in his villa with the name “Villa Margot” in the hills of southern France in a small village Villefranche-sur-Mer nearby Nice on the Mediterranean.

FOR SALE superb carriage horse, 5 years old, delivery car, truck, harness. – address F. M., 88, boulevard Ménilmontant
This advertisement was placed on October 19, 1912 in the magazine: La France Chevaline a magazine especially for equestrian affairs such as: stud farms, military remounts, competitions…

Source gallica.bnf.fr / Bibliothèque nationale de France