Now I know what kind of overdrive it is.
Laycock J-Type - #25 B400 reconditioned by ORS Repair service Sheffield.
A German Workshop for repairing overdrives told me that it is special because of the filler plug. The recommended oil is KRON 90EP. Also ATF 3 may be a solution.
The big plug at the bottom is not for draining. To change the oil the base plate must be take off.
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