Venezuela Escuelas, Imperforate

Rod, you've gone above and beyond the call of duty here - is there something like a philatelic medal that I can award you, something to wear proudly on your chest? If so, it's yours.
Your top scan shows a paper similar to my stamp in that it shows elements of fibre in the rag paper. The bottom stamp though appears to be of a totally different quality and I think it even shows elements of a design to it (lozenges?)
Anyway, at such a remove from the stamp's appearance, I doubt whether any more information is forthcoming. I am encouraged though, by use of the words "believed to be" and "most likely" - these leave room for a bit of manoeuvre and are in no way absolute.
So, with that bit of wishful thinking, thanks again.

How is it determined to be printers waste instead of trimmed rouletted stamp?
Don

I think it HIGHLY unlikely that at least one out of four sides wouldn't show evidence of rouletting - which leaves a) printer's waste b) a true imperforate.

It is not that uncommon to find trimmed stamps.
Don

Chazz,
helping others has its own reward,
I learn as well
Thanks for the kind words.