This is a New Old Stock American Bosch B4 magneto distributor cap.It's a very rare item, not available as a reproduction. Used on many US cars from the 20's.It is missing its central brush, but that can be easily replaced.I can send more photos on request PayPal accepted
"The K3 Magnette must rank in the history books as the most famous and successful of all the record breaking MGs. With only 33 examples produced durin..