P Bass 1951-1957 single coil pickup wire type?

[okabass]

AWG 42 I believe. But is it formvar, plain enamel...? I'd like to hear it from somebody who's really checked or rewound a real 50's P Bass single coil pickup.
Here's a 1957 P Bass PU. Doesn't look like formvar. 50's 7ender guitars seem to use formvar. Did they use different wire for bass PU?
http://www.dropbox.com/s/rn58votvv7y...31.07.png?dl=0

I may not be really important, but like to know it for sure.

I found pics from my friends original 9-57 P Bass. It is a spilt coil PU but only a few months after the change from single coil to split coil.
http://www.dropbox.com/s/9b5qtaj472l...04.14.png?dl=0

[okabass]

I found this.
" Fender used 42 gauge (43 gauge in some cases such as teles) formvar for their normal production guitars until March ‘64, then they switched to 42 gauge plain enamel. However, Fender used plain enamel for the P-Bass after switching from the single coil pickup to the split coil pickup at ‘58 ❮should be '57❯. As a matter of fact, they used plain enamel for all their bass models until they went back to formvar in the late 60s. In the early 70s they returned to using plain enamel again. "

http://www.talkbass.com/threads/is-t...ickup.1222997/

According to that guitars use formvar '50 to '64. After that PE wire. Basses: formvar '51 to '57 or '58, then plain enamel to late 60s. Then early 70s again PE.