Caroline,
Your White Rotary bobbin is the exact same bobbin my Kenmore takes. The 1/8" difference in diameter doesn't seem like much on paper, but in use I don't know.
I suppose I could thread up the unID'd bobbin and try it in my Kenmore. Well I could if I didn't have a dozen projects cluttering up my work area.
You are correct the two curved rim bobbins are for the 66 and the other one is a Class 15.
My wife has a bunch of those Class 15 bobbins with the 7 larger holes in them. They are for her Bernina 930. Hers are knurled around the axle. Take a look under that green thread and see what's there. You might have a fancy smancy bobbin. LOL
Sigh, I really should go downstairs and work on the projects. I just might get something done ...... maybe.
Joe
Last edited by J Miller; 02-25-2012 at 02:48 PM.