There are four printings: dark to light cream 1L1 of 1951, light cream clay CL2 of 1955, rust brown 1L5z Zarate of 1955, and 1L6 grid paper with small RA perpendicular to 1E1 of 1957.
1. The cream printings of 1951-52
2. Clay printing with cream frame of 1955, a very rare stamp on cover.
3. Rust brown 1L5z of 1955
4. The printing with the widest variability, the 1L6 with small RA perpendicular to the 1L1.
There are some examples with worn out blue plate.
