I was able to get a bit more info from the owner of this watch.
She popped the back off and here is the info found. I am unsure as to whether the serial is found on the case, or on the watch itself. The quality of the accompanying images shows the limitations of my photo setup -- my apologies.
Omega Watch C
(Omega Symbol) 480
Central Watch Case Co.
LAQUE or L 80 Micp
Now (and again) we have some pretty primitive tools we brought to the task.
These inscriptions were read with a small magnifying glass and so the accuracy of these readings is an educated guess.
Does any of this reveal anything?