I still have that circular saw , my wife bought it for me in 1969 when we were still in high school. She used S&H green stamps to buy it. I have always figured if it ever quits I will make some kind of desk lamp out of it.
I have a Black and Decker saw cat circular saw with a eight inch blade and a six inch grinder I bought in the late 90s still working.
You wouldn’t happen to have the yellow sawzall would you? I swear tracking this tool down is next to impossible. Of all the used tools in existence the old yellow sawzall is as rare as finding gold.