[MikeK]

Three coils and one empty shoe? That's one messed up starter!
EDIT: Perhaps not (see addition below this diagram)


Tom W said he has seen a Ford starter with an empty shoe and one finer reverse winding, likely for limiting speed. I found this drawing of several configurations, look at the lower right. In any case I'd feel more comfortable with the tried-and-true configuration that has no fine-wire coil!