Focus on the clay issues

I have long neglected this issue because I still lack a digital technique to examine the watermarks.

CL1A of 1939, 5ct and 10cBR



CL1B of 1943, 1c, 5ct, 10cBR, 30c, 40c, 1p, 1p-SO, 2p, and 20p











CL2A of 1949, 10cBR



CL2B of 1952, 40c, 50c, 50c-SO, 2 pesos



CL3 of 1952, thick paper only found on the 25c-SO.