She was actually built to be either - fitted with a side ramp at the stern and cell guides fitted part way down in the holds with "stoppers". These could be removed to allow a full containership configuration. There were two of them built in 1981 for London-based Seacontainers at an Italian shipyard for the charter market - their original names were "Contender Argent" and "Contender Bezant". The latter was sold to the Royal Fleet Auxiliary and converted in to the helicopter landing vessel "Argus" in the mid 1980's. The other sails today as a containership for Mediterranean Shipping Co. as "MSC Selin".
Did several trips on her in the mid 80's when she was with Sea Containers carrying out a 3 ship round the world service the others being the Nagara and Tavara. Mostly we carried containers 4 high above deck and two below with a mix of bulk cargo or vehicles on the Ro-Ro deck though we did once carried a full load of empty containers to Korea. She was self discharging so we often berthed at more exotic places that normal container ships. Good ship but very hard work.