As can be seen from the copies of Tony Rubiera, they had been produced before March 1939, and Tony refers to that type of coated paper by CL1A, letting the later [1941] coated papers have the CL1B!
rubiera » 13 Jul 2008 20:52 escribió: En 1941 se emite el tizado con el segundo papel, con impresion mas amarillenta, sobre papel CL1B, mas fino que el CL1A usado en 1939