The ones mentioned here are for the plate used beginning in 1949. The variety with the V of CENTAVOS deformed is likely found more than once on the plate, judging by how common it is. The variety with the outer line upper left corner clipped is repetitive since I find more than one on the same block. This strip also shows the variety with a dot after MAR.
first stamp left to right
third stamp left to right
What makes me think that a new plate was introduced in 1949 is that the issues from that year, the 2C or Straight Rays, share plate varieties with the later issues, and the issues from 1948, on the unwatermarked opaque paper (NOP) and before do not.
Here is a 2C with the variety with the outer line upper left corner clipped
Here is a variety I found several years ago as well as in the large lot I have been exmining lately. I only find it on the 1L3 from 1955, the printing with a bright yellow background.