The SVL, VL and EVL series from the early/mid 70's to the 80's were truly great saws. Robust and built to last were understatements. The fact they had modest chain speed was a trade off for their inherent longevity. They came equipped with all the features. External idle adjust, manual oiler overide and external output adjust. Ahead of the time. The AV was great for the era. They ran smooth and pull(ed) strong. The Oilers through the the series were ridiculously effective. I run them frequently, and aside from plumbing deteriorating, they rarely spring air leaks, even after decades. The EVL ignition setups were the Achilles, though. The point setups were bullet proof. Some of mine I don't mind getting dirty.
For those that enjoy the old Echos...
I tore down one of my 1001 a couple weeks ago to redo the oil system. My dad bought it new in '79. It wasn't oiling well in the first video, after sitting for a few years. Stuck check ball valves in the circuit and new plumbing.
A 701 from '74 wearing the Craftsman colours.
A well used 750 still pulling strong.
A 500 getting down.
A 452 up to the task.
https://www.youtube.com/watch?v=rZiwc8O6E-4