In original condition - Bosch BK starter motor, 12 volts. The starter is tested and it spins, but slowly. Needs internal cleaning. I can provide a video.
This tank has been in our spares store for many years. It appears to have been reconditioned and then not used. Including the fittings it is 12 inches tall and 4 1/2 inches diameter. A few small marks in the finish but overall excellent condition.
Scintilla 6 Volts Starter Motor .Fixation by three bolts : distance between them = 13 cm , 12 cm 10.6 cmHole in the engine : 95 mm`Gear has 9 teeth and a diameter of 35mm