There are three different versions of the Comet circular saw that I know of;
The first & earliest (1961 or earlier) branded Comet C/Saw, I can't imagine many survived for long without the tank getting damaged;
Second version same as yours, also branded Comet C/Saw with improved tank handle;
And finally the later version, branded Comet Tote'N Tools, with cast tank;
Have you got the special cover that Comet used for the magneto coil?
David
P.S. None of these are mine, I only have a Comet pump myself.