Your machine is a Model 66, 1 of 35,000 allotted May 5, 1928.
Needle system: 15x1
On needle packages you'll find this info:
Singer: 2020 (15x1), 2026 Denim/Jeans, 2045 Ball Points
Schmetz: 130/705H 15x1H
Organ: HAx1 130/705H 15x1
Class 66 metal bobbins are OEM type.
However you can use the Class 66 plastic bobbins if you have them.
(Best metal ones I've found are at Sew-Classic {
http://www.shop.sew-classic.com/ }
Motor belt:
193077
( Also available at Sew-Classic )
Accessories and presser feet are Low Shank design.
MACHINE;
Singer sewing machine oil or equivalent.
MOTOR;
Singer motor lube in the tube grease.
If that can’t be found use petroleum jelly as a substitute.
Do not use any synthetic or high temperature grease in the motor.
( Nova Montgomery sells an equivalent lube here: {
http://www.novamontgomery.com/shop/S...t-x4312153.htm }
I haven't tried it yet, but at least one other QB member has.
The manual can be found as a download at {
http://www.singerco.com/support/instruction-manuals }
Hope this helps some.
Joe