The O 10000 saw duty in the 1930s as an urban bus and long-distance coach and impressed people by its very size. The exhibited vehicle served the Austrian Postal Service as a parcel truck after World War II, plying the Salzburg – Vienna route. Later on it was converted into a mobile post office which saw use at events like the Salzburg Festival or as a temporary post office.

• Cylinders 6
• Displacement 683 cu in
• Output 150 hp (110kW)
• at engine speed 1700 / min
• Top speed 40 mph
• Production period 1937-1941
• Units produced 386