very cool Joe that you brought your dads saw back to life. My father and I also cut a lot of wood with saws that would be considered marginal limbing saws today. I had a little Dynamark and my dad and I both bought 16 inch Skilsaws as back up saws (I found them on sale somewhere for around $50 brand new), my dad used his Stihl 015L for most of his cutting.
I will take real grunt over rpm any day for a chainsaw engine. The little Skilsaw had that. I think they were made in Canada by the same company that produced the big Canadien saws.
A family connection with saws is always a good thing.