In photogravure we can usually recognize the screen albeit at the edges. At times the edges seem closed on all sides!
Had this been done on purpose or was it a coincidence??
Judging from the Mexican 40p Libros you may get the idea it was done on purpose! We can even see a tiny dot on top of the "4"! This occurs in all my 40p copies...
The 200p Citricos with burelage [con trama] seems to have a normal (green) screen!
However I do have a copy with the (green) screen closed like in the 40p! Only by coincidence I noticed it had a inverted burelage as well [trama invertida].
It seems to me now that for the 200p Citricos a NEW cylinder for green must been used....