JoAnn,
There is a bunch of holes across the top. They are oil holes. Also on the hand wheel. Oil those too. Regular sewing machine oil is fine. I'm just fond of Tri-Flow.
White rotary machines share several design features that make them stand out. The hand wheel and stop motion knob are two. The tensions, the bobbins, are others. Some were rounded in shape, some squared, some faceted. But they were made by White.
The crinkle ones came in OD Green, dark brown, tan and dark brown bi-color, blue, black, a reddish brown, and maybe others. And don't forget the older White Family Rotary machines and their badged versions too.
There are many variations. One could make a really interesting collection just with the White made rotary machines.
Joe