I'm no expert on watches of that era, but a couple of observations:
Note how white the hands and face markings are compared to the condition of the case. I find it unusual that a watch of that age where the guts are exposed to the atmosphere would have such vibrantly white markings.
There is no serial number on the movement, which I find to be unusual for a CYMA.
This is a good example of a 1940's CYMA movement:
http://img.timezone.com/img/articles...7123/pwqa4.jpg