The Washburn W623 humbucker is a bridge humbucking pickup. Not much is know about these pickups. They are manufactured in Korea by a manufacturer callad Samshin. Someone on the washburn forum measured the W623 bridge pickup and also the W621 neck pickup and measured 8.6kOhms for the neck pickup and 10.6kOhms for the bridge pickup. He also mentioned Alnico 5 magnets.