Although they are not listed here,
you can spend some time with lovely scans of Spanish sundries,
they list the Spanish Civil war, but only a few examples.
It has helped me identify a lot of weird stuff I have found,
(help as well from Tracy Barber and his Spanish knowledge)
enjoy
http://orpheus.ucsd.edu/speccoll/swstamps/#introduction
"Pedro"
Hello,
I've just checked 2009 and 2000 editions of Spanish Edifil catalog and
they do not list them. It is the first time I see those sheets. If
possible
I'll ask a national expert when he comes from his holidays in a month or
so.
They do not seem to be listed in the civil war years nor post-war years,
nor
in the Beneficencia (Charity) section, so I assume they are really rare,
or
not issued proofs.
Pedro