12.68Z - 1937
"...For your information, Longines did produced dials with the name of the retailer on their request, such as Harrods, Turler, Cuervo y Sobrinos, … The two last names are more common but Harrods is more rare (we only saw one watch with the name Harrods on it)...
Jennifer Bochud
Museum Curator"
I wonder what causes that very special patina. Could it be fungus?