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Looks like a 3.5 - 2.5 jack? The single phono might be another option as opposed to be used as well as. Although why there isnt a left and right channel on the phono i have no idea.
The cam would have 3.5mm audio OUT ---> this would go to either a 3.5mm (to go in to amp/speakers) OR a single phono for MONO sound (not stereo!).
Would explain it! AND it would probably be an old camcorder! (might even come with a single phono splitter to make to 2 phonos (left/right) but still MONO).