Heh...if they're the ones with Buster Crabbe, they're older than that - from the 30s. We used to have some of those...
All the uniforms looked to be leftover from other shows. Like, in one episode, they landed on a planet so they weren't wearing their "space" uniforms. All the good guys were dressed like Robin Hood and all the bad guys had Roman soldier outfits.
And the acting is delightfully dreadful!
I think they did make some in the 50s, too, though. I haven't seen those.
I saw Flash Gordon in the cinema! No kidding, it was back in 1980 and it's all very vague (it was vague the day after I saw it.) Queen did the soundtrack and I still remember *that* part of it, even though I've never seen it since!
Flash - Ah - Saviour of the universe
Flash - Ah - He'll save ev'ry one of us
Heh heh heh...oh my.