NOS in the original box.
Mercedes Avog 2 speed blower motor and fan for the W180 220S, W128 220SE and other models. The lower end Ponton used a single speed fan.
12V
The diameter of the housing is 4.5 inches and also the depth to the motor end.

The 2 speed motor is no longer available from Mercedes and Neimoller in Germany charges over $1400 to replace yours with a core.

I have a couple others listed in different size single and 2 speed.