They are not listed in Scott. They are known as "Frama Labels", or "Variable Value Stamps", somewhat like meters or computer vended postage. https://en.wikipedia.org/wiki/Variable_value_stamp
You can check out all the Spanish Frama, ATM, etc. labels here: http://www.galeriaatm.com/en/56--spain
Recently also discussed here: https://stamporama.com/discboard/disc_main.php?action=20&id=21431
Most major catalogues list these, the only exception being Scott (no real surprise about that)
Interesting discussions. Thanks everybody for help. Virgil
