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This may be a bit of a stretch, since it's a silent movie and probably not often televised, but this scene from the 1924 The Sea Hawk seems to fit the bill (though with a chain instead of a hammer). The escape begins a bit after the 3-minute mark.
No that's not it. It was definitely a talkie and was in real black and white not sepia toned.
I remember somtime in The '90s my dad was watching some old movie in black and white. Itt showed some slaves rowing on a ship but then one of them gets a hammer some how (?) and knocks out the captain. I stopped watching after that. I assume it's a movie but could be a show
Edited by Bootlebat