Are These Stamps, Or Cinderellas? What Country?

Hi to all

I have no idea what country these are from.
They look like airmails, they mention Seville and the date 1930 and have an inscription "Pro Union Iberoamerica"
Any help appreciated.
Regards
Horamakhet

Hello!
Air mail stamps from Spain!

These are Spanish airmail stamps from 1930

Chimo

Bujutsu

Spain, airmails, part of the C50-C57 set.

I like the Pro Union Iberoamerica as it may refer to some unification of air service across the Iberian peninsula (Spain, Catalonya, Portugal, Basque areas).

One more thing that hasn't been mentioned is the fact
that there are Reprints out there which are
worth 1/10 of the value of the originals.

Hard to tell on your scan if yours are original.
I have some of the reprints which have blurred
impressions, yellowish paper
According to the footnote in Scott.

You can also add these to the list of stamps which
do not display the country's name.

Hi

Thanks to all, great help as always

Lithograving, thanks for the advice, my family were great travellers from the 1880"S to the late 1930's,and members were always doing the "Grand Tour" (Now I know where all the money went) and sent many letters home to England,
The paper is white, but that easy to forge as well.
but that does not mean they did not buy forgeries, So I will do some research.

apparently it was also in reference to a spanish american exhibition in 1930 as well.