I was wondering, who first had the idea to follow up a successful film with a second part? I do not mean a series or a trilogy like "The Godfather", but a film being simply weaker copy of the first version. In the 1940s, nobody would have proposed to make "Casablanca 2: Rick does it again" just because part 1 was such a hit. yet by the 1980s it was commonplace.
Off the top of my head, the earliest occurrence I can think of is "Jaws 2" from 1978. Can anybody think of an earlier one?
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