15c Martin Guemes 'break under first A of ARGENTINA'

These two blocks have this plate variety. By its scarcity I postulate that it is not common on the plate, although when I compare the overprints from each block and the additional flaws on the second block, I find that these are two separate plate positions.

Here is a detail of this flaw:



The upper left stamp in the following block is the plate variety.



The upper right stamp in the following block is the plate variety.



Here are the comparisons of the plate flaws and the relative distance between the overprints.



Focusing on the L of OFICIAL in the overprint we can see that these are different types of the overprint for the same flaw and same positions relative to the flaw.