04/30/2008. Remarks by Johan Visschedijk: "Produced as an OY-1 for the USN under BuNo. 03932, this aircraft is seen in the markings of USMC Marine Observation Squadron VMO-1 'Yazoo'. It was converted to a OY-2 when it changed for standardization from a 12 volts to a 24 volts electrical system."