Maison Bernot Frères - Location 0.20 Franc - Bon pour un sac vide - 5 F.20
(Rent 0.20 Franc - Good for an empty bag - 5 F 20)
Chaque sac en bon état accompagné de ce jeton sera repris pour 5 Francs
(Every bag in good condition accompanied with this token will be taken back for 5 Francs)
Aluminium octogonal, hole, 26 mm - Undated

(Wood, Coals and Cokes, source : Gadoury-Elie 1990)
This token which we find in both catalogs of Emergency coins, Gadoury-Elie 1990 and Elie 2003, is more similar to a token of deposit than in, it seems to me, a emergency coin.