The 1967 Casino Royale is more a Peter Sellers movie than a Bond movie. As a Bond movie per se, it's close to the worst ever made.
Classic Bond movies that established the franchise: Dr. No (1962), Goldfinger (1964), From Russia with Love (1964) and Thunderball (1965).
Best way to see them: half-price at a drive-in movie theater, because you snuck in inside the trunk of a car, with a bunch of goofy friends.
I'm not totally out-to-lunch here in rating those 4 among the best: https://editorial.rottentomatoes.com/guide/james-bond-movies/3/
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