Very informative. I still have my dads 60 year old Black & Decker 8-1/4 inch circular saw. It still runs and cuts very well. I dont use it on the job of course. Its in my tool museum with many of his tools he used to support me and my brothers & sisters.
Pictured below, Dads old Black & Decker 8-1/4 inch and my Milwaukee 8-1/4 inch worm drive saw.