Mercedes emblem hood ornament, vintage part saved off of an old car

I think this is hood ornament from an actual car (it's out of an estate where a Mercedes would not be unexpected), but I don't know anything at all about collector's cars, so please take a good look at the photos! It's 3" across the circle, all metal (an aluminum alloy?) with a silvery finish.

sale price: $16.00
Item No. z8947