here's the chronology of the MicroTronic's throughout the years.
mid-1980, 18780 X2000, angled panel design, 800RPM, later versions got a chrome door trim.
early 1982, 18880 X2000, angled panel design, 1000RPM.
March 1983, 18871/18872 white/almond exclusive models sold concurrently with the...