Winter 1964 Anime

Invited to Nazi during World War II, Dr. Asagumo is asked by Hitler to collaborate with him on the research of the new weapon "Big X". Concerned about the possible effects of the completion of Big X, Dr. Asagumo intentionally delays the progress of the research, conspiring with his co-researcher, the devious Dr. Engel. Immediately before is defeated by the Allies, Dr. Asagumo implants a card inscribed with the secret of Big X in his son, Shigeru, and is then shot to death by the German army. Twenty years later, the card is discovered in the body of Shigeru, who is then living in Tokyo. Soon, an organization claiming alliance with the Nazis appears, steals the card, and completes the Big X project. Dr. Engel's grandson has ed the Nazi Alliance. The completed Big X is then revealed to be a drug that can expand the human body without limitation. Recovering Big X from the enemy, Shigeru's son Akira fearlessly challenges the Nazi Alliance and Hans Engel, who are plotting to conquer the world.

(Source: Wikipedia)

Note: Most of the series is lost media. Only episodes 1, 11, & 40-59 are known to still exist.

Based on a manga by Fujiko (A) Fujio and Fujiko (F) Fujio.

The adventures of a zero fighter pilot during World War II.

(Source: AniDB)

The homeless dog Rock swears to take to revenge on a tiger named Killer in the zoo, who had killed his mother. The dogs in town, troubled by the atrocities of Killer, forces to Rock. Changing the target of revenge to the murderer of the main character's mother made it easier for kids to empathize with the character.

(Source: AnimeNfo)

Short animated film by acclaimed multi-talented artist WADA Makoto. In 1964, Murder won the third ever Oofuji Noburou Award at the Mainichi Film Awards.

Experimental animation by artist and illustrator Manabe Hiroshi, member of the Animation Sannin no Kai pioneer group of independent animation.

Three short films by the Japanese avant-garde illustrator and animator. Regarded (unfairly) as the Japanese equivalent of Andy Warhol, these films showcase a distinctively commercial illustration look reminiscent of the current pop art movement of that decade (1960s).

(Source: AniList.co)

Music video for the song Deka Chibi Noppo by Mary Suwa and the NHK Tokyo Jidou Gasshoudan that was featured on NHK's Minna no Uta program. It is considered to be lost media.