Omega Seamaster Cal. 503 Redial Identification

Although quite controversial, I ended up purchasing an Omega Seamaster Cal. 503 w/ a redial to use as a learning tool and semi-weekly wearer. It's all been going great, in large part to the wonderful community here.
I have a second seamaster of the same case ref and movement on its way so I can use it for spare parts if the need arises, as well as finally getting my poor missing bezel. (Did not notice it was missing a bezel when I purchased it...)

While taking apart the movement, and removing the dial, I noticed some interesting writing on the back of the dial. Is anyone able to make out what it means besides azul>blue and redial?

Thanks!