The only markings on the lens beside the make, model and focal length, etc., is the number 822 stamped on the body, under the locking ring.
According to Kodak's publication (linked above) the Ektra was introduced in 1942 but I think you are onto something with the hyphen.
"M" would stand for 3. That might mean that the camera was manufactured in 1943.
But if "A" stands for 2, that might mean that it was made in 1942.
The serial number is 1207. From my research, there were only about 2500 of these cameras ever made. Over the the seven year span that the camera was made, that comes out about 350 units per year. It is also my understanding that the series started with the number 1000. If you do the math, that means that the camera I have might have been made in late in higher first year or early in the second year of manufacture.
Am I on track, so far?
If I put all the puzzle pieces together, I would guess that the camera was made in 1942.
That's about the best I can figure.
What do you think?