Creature From the Black Lagoon (1954)
I've been trying to educate myself on more films made before the 1970's, and even 1960's and fortunately Instant Netflix has opened up a pretty decent library. This film was pretty decent for it's time (I mean this was the decade when there was a movie about a gorilla from outer space who wore a diving helmet). The action was pretty good but the film did suffer a little from being formulaic, but that's not automatically a strike against it. Overall it's a film I would definitely revisit.