VH-SJU arrived in Australia in 1969 as a standard Beech 55 Baron. When seen in 1981 it had President 600 written on the cowlings. The President 600 was a modification by Colemill in which the Continental O-470 engines and two-bladed props were replaced by Continental O-520 engines and three-bladed props, essentially making a C55 Baron. However, there has been no change of type for -SJU on the register, which in 2018 listed the engine type as O-470. It does have three bladed props.