Argentina Scott #1265-1267 FIRST DAY COVERS Satellite Communications $$ 378228
Argentina Scott #1234 FIRST DAY COVER Satellite Communication $$ 378226
Argentina Scott #C105 FIRST DAY COVER Argentina and Antarctica $$ 378222
Argentina Scott #1265-1267 FIRST DAY COVERS Satellite Communications $$ 378218
Argentina Scott #902//C115 FIRST DAY COVER Communication INTELSAT $$ 378217
Argentina Scott #902//C115 FIRST DAY COVER Communication INTELSAT $$ 378216
Argentina Scott #977 FIRST DAY COVER National Meteorological Service $$ 378214
Argentina Scott #977 FIRST DAY COVER National Meteorological Service $$ 378212
Argentina Scott #1261 FIRST DAY COVER ITU Regional Conference 1980 $$ 378210
Djibouti Scott #C233a-C234a FIRST DAY COVERS Telstar, 25th ANN $$
Russia Scott #5809 FIRST DAY COVER Alexander Popov, Radio Inventor $$
Luxembourg Scott #406 FIRST DAY COVER Telephone Automation Philatelic Org. $$