Many of the early Fender pickups used both North and South magnetic polarity. Older Broadcasters, No Casters, Telecasters and Esquires are found with both North and South bridge pickups. I have seen rhythm pickups on early models to have both North and South polarities. Both lead and rhythm pickups on these models were wound Top Left-Top Coming or the magnet wire was wound counter-clockwise from start to finish. Early Stratocaster pickups have North polarity till around 1957 then they became South polarity. The Stratocaster pickups are wound Top Left-Top Going or the magnet wire is wound clockwise from start to finish.