In total, 18,995[1] units of the Unimog 421 were built from 1966 to 1989 in the Mercedes-Benz Gaggenau plant.

From 1969 to 1971, 601 cabrios and 152 closed cab units of the Unimog 431 were made.

Daimler-Benz produced CKD-kits in Gaggenau, which were then shipped to Argentina for manufacture.

The 431-series was fitted with a 44 kW (59 hp; 60 PS) engine, but has the short wheelbase – this combination was not available for the original 421-series.

[1] Several Unimog 421 types were custom-made as OEM parts for third party manufacturers.