Tatsuo Yoshida (story) and Shigeru Akimoto (art) 新造人間キャシャーン Neo-Human Casshan; page from テレビマガジン TV Magazine, June 1974
"Please defeat the iron demon! If Casshan doesn't do it, who will?"
"Currently airing on Fuji TV!"

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Tatsuo Yoshida (story) and Shigeru Akimoto (art) 新造人間キャシャーン Neo-Human Casshan; page from テレビマガジン TV Magazine, June 1974
"Please defeat the iron demon! If Casshan doesn't do it, who will?"
"Currently airing on Fuji TV!"

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Tatsuo Yoshida's 新造人間キャシャーン Neo Human Casshern drawn by Shigeru Akimoto; page from テレビマガジン TV Magazine, August 1973
新造人間キャシャーン (Shinzō Ningen Kyashān - Neo Human Casshern) by Ippei Kuri
Page from テレビマガジン TV Magazine, October 1973
Tatsuo Yoshida's 新造人間キャシャーン Neo Human Casshan - Shigeru Akimoto's manga version
“Quel che si dice il canto del cigno”. Inciampare nell’edizione italiana di questo antico singolo di Harry Nilsson (1972) – il suo più grande successo, anche se in tempi recenti si ri-sente un sacco in giro per film e serie tv la notevole B-side – e come prima cosa pensare al tragico personaggio della madre-cigno nello straziante anime del 1973 (per cui comunque venuto dopo…) “Kyashan”. KYASHAN

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新造人間キャシャーン Neo-Human Casshan (Casshern/Kyashan) OP sung by ささきいさお Isao Sasaki - Columbia Records, 1973
I found a video of Isao Sasaki singing it live in 2016:
Shinzō Ningen Kyashān (Casshan), created by Tatsunoko Production founder Tatsuo Yoshida, 1973
Another "internal structure" image, this is Tatsuo Yoshida's "Neo-Human Casshern" (Shinzō Ningen Kyashān, Tatsunoko Production, 1973)