OKK (6M) or is 8M (8 hole turret) I helped retrofit in the mid 90's was, and still is, a nice piece of hardware.
Solid workhorse. Only the fine magnetically operated clutches in the head were a problem - split one, and welded it back together. Make sure the lube system is always working, with an alarm to detect failure.
Some of the old limit switches become a bit unreliable. Always use failsafe circuitry. The old controller was dumped because all the diodes, amongst other thing s were literally falling apart.
Flick a blob shaped diode and only the wires would remain while the blob went airborne.
Replaced the control with a BOSCH CC120, and a 15KW VFD for the spindle. Encoders on the servos with screw mapping. Damn solid stuff.