I have the 12 inch long by 8 inch high model of that from the Franklin Mint.
The flywheel turns and looks like it will power the wheels if put in gear...

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1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/diesel-discussion/10414-help-i-need-check-stretch.html

http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html

evap fin cleaning:

http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator

A/C thread

http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html

That is NOT the world's first car. Look up the Marcus car that pre-dates the Benz by a decade. Never mind Cugnot (sp?) in France who was a century earlier though steam powered.

Dan