Fish, welcome to the forum.
Back in the '60s and '70s, Homelite and McCulloch were the Ford & Chevy of chainsaws--solid American made dependable tools. I started with a McCulloch 10-10 in '76, but some of my neighbors were running Homelites. Your impulse to stay with the saw that served you well for years is understandable. But you'll thank yourself later if you graduate to a current generation saw. They are easier and more efficient to use and will not vibrate your hands into numbness.
Spoil yerself--go to a dealer and buy a Husqvarna of the size (CCs of displacement and length of bar) that suits your needs. A whole crew will soon chime in to recommend Stihl instead, but either way you'll get good tool. And Echo seems to make good saws. Be wary of the cheap saws sold at bigbox stores.
But really, if you want to dice up trees, and not just indulge nostalgia, get a new saw. You won't look back.
Of course, if your desire is purely nostalgic, yes, those saws can be found.