Nice postings. The Argentinians are Michel #1 from 27 December 1995. Michel describes these as "Leerfeld", meaning that they were not processed/printed with a value by dot matrix. These are actually quite a bit pricier when they have the value printed...350 euros mint, and unpriced as used. The Leerfelds are priced at 20 euros each. 1.5 million of the unvalued labels were printed.
The Israelis are printed on the French "Amiel" equipment. Portugal, the Czech Republic, have used this equipment/format also.
Here are some earlier Costa Ricans. All of these are printed in the Epelsa Corp.(Spain) format, with a large "C" shaped security die cut in the middle of the label. Information given is from Michel Automatenmarken-Spezial 2008/2009, so details on the last 2 are unknown to me. Numbers reflect number of blank labels printed rather than actual number of stamps/labels valued and sold.
1.) 7/16/02 Manzanillo Beach, 4.48 million
2.) 9/24/2003 Red-Eyed Tree Frog, 2.85 million
3.) 2/2004 Scuba Diving, 2.85 million
4.) 11/2004 Aranal Volcano, 2,827,200
5.) 4/2005 Irazu Volcano, 2,872,800
6.) 5/2005 Poison Dart Frog, 2,872,800
8.) 2010 Gulf of Papagayo
9.)2010 Olive Ridley Sea Turtle