They're many, the oldest title I ever read was from the 50s, but unfortunately it's not available in this site, also you come to right person, since I love retro manga, here's some of my favs:
https://www.mangago.me/read-manga/heart_of_thomas/
https://www.mangago.me/read-manga/kaze_to_ki_no_uta/
https://www.mangago.me/read-manga/zankoku_na_kami_ga......
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