Examples of the type

Picture 1 of the example of 1 Sen Picture 1 of the example of 1 Sen
© Eagle68 (CC BY-NC-SA)
1964 – (en) P#90a
103 × 52 mm
Picture 1 of the example of 1 Sen Picture 1 of the example of 1 Sen
© JLHare (CC BY-NC-SA)
Private collection
1964 – (en) P#90r - Replacement note with first serial # prefix letter "X".
My note