grouping the various issues

I finally have some time to compile additional groups. These are for all the issues from 1E2 to 2C, and all that remains are the late printings beginning in 1951.

The 1E2, including 'Servicio Oficial':



The 1E3 including 'Servicio Oficial':



The 1E4 including 'Servicio Oficial':



Clays and Straight Rays from before 1945:



The NGR unwatermarked regulars and officials:



The unwatermarked opaque (NOP) and Straight Rays clear (2C):



There are a few errors and omissions, but this is the starting point I need for now.