This big Longines, cal 12.68Z, has been left sitting in the box for a while. I do not know why. The smudge above "Longines" is on the crystal - not the dial.
This is an early '70s manual wind Baume et Mercier, 14K with opal dial. My father has had it since new, and he recently gifted it to me. Sorry, no movement shot yet...a bit tricky to open it. My watchmaker serviced it a few years ago, and he was very impressed by its quality.