OMyStarz,
Welcome to the Quilting Board.
As you have researched that is a Singer 66- probably 4 machine. Most likely began it's life in a treadle base and was electrified.
In later years Singer had a lot of early machines refurbished at some of their authorized repair centers and they were painted with black crinkle paint.
We've seen 66s, 99s, 127s, 128, 221s, and other with that paint scheme. The thing is, Singer also manufactured versions like that too. This one is a refurb though.
It's a good machine to use as is, or you could put a spoked hand wheel back on it, pull the electrical parts off and put it back in a treadle base. Either way, it's good you rescued it.
Joe