Custom Shop '62 Jazz Pickups - No 60 cycle hum ??

[ingraha3]

Hi there,
I was fortunate enough to be able to buy this beautiful Fender CS Jazz Bass.
I got it on Reverb, not from an Authorized Fender dealer.
The build sheet lists the pickups as follows:

Vint J-Bass Rhythm 0020906000
Vint J-Bass Lead 0020908000

I'm curious if possibly they were changed out to something else as they have no 60 cycle hum. When the bridge or neck pickup is cranked and the other off, no hum at all.
Strange right? The pickups have no identifying features so I'm curious your thoughts.
Thank you in advance.
Stay well,
Chris

 

[TrustRod]

I don't see anything that would make them humbuckers. The only thing I could think of that would do that is a dummy coil hidden somewhere under the pickguard.