Mercedes vent window knob- 1117605266 for models of the late 60’s.

The diameter of the knurled knob is over 2 inches, about 54mm. The metal shaft is also longer at 3/4 inch than the early shorter version. The thickness of the knurled edge is 1/2 inch.

The cap in the photo is not included but shown as that is the version this knob is for.