 If you liked
Tetsujin 28-gou (2004)
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 ...then you might like
Concrete Revolutio: Choujin Gensou
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Both series utilize the history of Showa Japan to contextualize their exploration of various topics which occasionally dip into the same territory; Tetsujin 28-go is set in the mid-late 50s while Concrete Revolutio spans the mid 60s to early 70s. Historical events are frequently referenced. Both feature mecha action.