A new Cuban 1-peso note has been reported. At first glance, this appears to be just a new date (2003 versus 2002) variety. However, closer examination reveals subtle differences. On the front, the series letters (GD in example above) are green, not red. On the back, the yellow underprint is missing (compare B901b detail above left with that of B901c above right).
Courtesy of Frank van Tiel.