LOUIS HAYWARD was born to play the lead in swashbuckler movies like this one; and 60 years ago when he did movies in modern clothes the public wished he was in a movie like this one.
A well made action adventure which relies heavily on character and story -- and less on today's annoying jump-around camera "work" and editing -- without the silliness of Jerry Bruckheimer and Johnny Depp -- this was what pirate movies were all about.
One thing about CAPTAIN PIRATE is the slavery thing which is not the main focus but is a vital part of the story. The slaves were in Jamaica, and in Martinique, and Santo Domingo, and a lot of other places. England, Spain, Netherlands, France; they all enjoyed the benefits of "live gold" -- but kept their slaves out-of-sight in the Caribbean (and other places). America was the country that ENDED slavery; but all the same we hear bellyaching about it 150 years later -- not just from Blacks but from white liberals and their endless hand-wringing "White Guilt" -- even though nobody's been a slave or owned a slave in a century-and-a-half. Captain Blood did NOT like slavery -- most particularly since he was an ex-slave (oh, yes; white slaves too).
This fine movie, as well as the earlier "Fortunes of Captain Blood" are available on DVD. I recommend both. Or either.