FRENCH POLYNESIA (TAHITI) on 18 December 1965 offered a First Day Cover stamp marking the 50th Anniversary of the first Tahiti-France radio link (29 December 1915).
I am assuming "radio link" is referring partly to ORTF to Radio Tahiti as well as other communication links.
I obtained this FDC because Radio Tahiti was one of those Asia-Pacific stations I logged in the 1970s while living in Colorado (USA). I especially remember listening at nights. Polynesian music played non-stop while it snowed in Denver, and I would imagine sunny, palm-fringed beaches and beautiful people in native dress, far away from this miserable cold, grey, snowy winter's night.