French classification based on month of August flower head at centre being a common design for French seals but no product or company yet associated with this seal.
Daniel Slowik has provided this connection - Nord Moulins de Don showing it undoubtedly to be a flour bag seal.
From Philippe Lanez, "I think we have to read AOÛT 1888 = AUGUST 1888:-
CYLINDRES// DON in curving upward & downward legend = CYLINDERS//DON.
We already met DON flour bag seals, I suppose this one fron North of France."