As the seller wrote, the original Alembic Single Coils were changed, right now there are 2 original Alembic Humbucker in the bass, working with the series I electronic. All the specifications of the series I electronic seems to work in order. The original Humbucker will be delivered to. He changed them cause of the typical noises of Alembic Humbuckers. This bass is from 1981 has a few optical minor issues, nothing going into the wood, usual for this age.