Originally: Gibson's zebra bridge (cream slugs/black screws) became a sort of a standard for them a long time ago.
Duncan's "regular zebra" was meant to differentiate Seymour's fabulous work from the rest of the crowd, I suppose. Duncan also sells "reverse zebra" ala-Gibson, for those who want the cream slugs/black screws for various reasons.
This sounds like a "reverse zebra" (ala Gibson scheme) pickup. I like the reverse zebra look myself.