The vehicle has been heavily restored, and Unimogs were always offered with a range of optional modifications, making identification of the build year a challenge. From the shape of the rear window this is a post-1970 vehicle, and from the shape of the grille it is a pre-1979 vehicle. The step up to the cab was modified after 1974: this vehicle does not include that modification, so is presumably from 1974 or earlier.
The engine used in the 406 is a 5.7 litre OM 353 diesel engine (62 kW).
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