keijo - lots of appreciation for your fabulous 'research'. I think your 'speculation' is the most plausible explanation, equal with what I suggested early in this thread:
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It could potentially be a imperf stamps that has been privately perfed
I have already noted it as such in my collection.
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Those perfs look very regular compared to many
Paco - thanks for your contribution, and I absolutely agree on that observation, the perfs are often seen quite "irregular" on stamps of Spain at this time. Interesting then, for your suggestion to be relevant - have you seen the Franco heads with perfs that is both inregular and at the same time deviating as much as 0,75 from the listed nominal perforation?