I recently scored an Aria violin bass that has the same Hofner style, staple pickups.

They are humbuckers. My electronics are different, only a toggle pickup selector, volume and tone, so yours may sound different, but I love these pickups.
It has been suggested to me, and I have no way to confirm or refute this, that these pickups were actually being supplied to the Japanese makers in the 60's and 70's by Hofner. Regardless, I get the feeling these pups were considered an upgrade in the world of Japanese violin basses.
If you are thinking of parting out this bass, as indicated in Jimmy's Realistic thread, please PM me.
JBY