The Amazing 3 (partially lost English dub of anime series; 1965)
The Amazing 3 (Wonder 3 or W3 in Japan) is a 1965 Manga series created by legendary manga writer Osamu Tezuka. It focuses on a trio of alien disguised as a duck,horse, and a rabbit. An anime adaptation of the manga started airing on Japanese and American television in 1965. While the Japanese version of the anime can still be found on the Internet, the American dub is very hard to find and is rumored to be destroyed. The last time the English dub of the anime was ever aired and seen in on American Television was during the 1970's on Kcop-TV as reruns. A few episodes of the English dub were uploaded to YouTube sometime in 2013 or 2014 but later got removed for unknown reason.
Findings
Youtube user peter vasiliou uploaded 2 and 1/2 episodes in English (not the best quality) he says he will try uploading more when he has time.