Yours looks like it could be that old, except for the handle. The first #77 skilsaw was introduced in 1937. I appreciate the advice and will let you know if it's fixed. When I went to get supplies to work on it, an electric motor tech said that the switches are usually dirty and the contacts worn.
I find the saw easier to control than any other I've used. If I hold on to both handles, torque is no problem. If it shorted out there, the switch should still be good. section of you hardware & buy a small can of 'Liquid Insulation' (or something like that) & coat the terminals. Separate the terminals you soldered, even it you have to file out a little solder. If you intend trying to sell it then perhaps it is better for parts.
If you intend keeping it to use no price is too much. Pretty common saw and you need to weigh the part cost against the value of the finished product. Take my word.have a strong wrist when you pull the trigger. Very popular if you are doing post and beam construction. They actually require gear oil to keep them running. Try this place - the same type switches may have been used in different models but they show diagrams and descriptions
