Magneto bearing N3048, (N2703) 15 x 37 x 8 mm used on some MO1L magdynos.
Superior brass bearing cage.
Magneto bearings, also used in dynamos and vintage electric motors consist of a deep groove ball bearing inner ring and an outer ring with only a single shoulder that allows the inner race to be easily installed to the outer race.
They are ideally suited to low load, high speed applications and are often used in a pair, with the open sides of the races facing each other.
Sale is for one bearing.