Re: 1966 strat pickups?
no.
plain enamel is pe - used on old gibson pups and fender teles
poly is used on many modern designs
as far as magnet size, when cbs took over fender in '65 they started making changes. they started using smaller magnets and different wire and dropping the number of turns. an early 60's strat pup might have .195" diameter magnets and 8400 turns of 42 formvar wire, a late 60's strat pup might have .187" diameter magnets and 7600 turns of 42 pe