Here is a Graupner azimuth drive unit, it was actually used in quite a lot of their models from the late 1970's up until the late 90's. As quoted, it is Graupner part number 1775. AZIMUTH PROP/RUDDER.
The GRAUPNER 1775 AZIMUTH RUDDER PROPELLER DRIVE UNIT would be an ideal fit for model boat enthusiasts seeking a high-quality radio-controlled propeller drive unit that offers precise steering adjustments.