Hallo Jelle, welkom! Beautiful bass, but am I correct in assuming that without a back laminate (not sure from these pictures) and purpleheart neck laminates it's actually a MK Standard? If the serial# says MJ instead of MK that's the case. If you post a serial# request in this or in a new topic the good people of Alembic can reveal all... (wood card, birth certificate, info from the 'A-files')
Wilfred