From Shogun1261 and Famous Classic Tales:
Five years after the studio adapted Alexandre Dumas' Three Musketeers into a component of the Banana Splits, Hanna-Barbera produced a more faithful adaptation of the classic novel. It's just too bad no cable network worth its salt can even be bothered to dust this off. Admittedly, this looks as though the open was edited off.
Edit: 10/7/15: The video has been deleted due to copyright issues.
My memory is vague when it comes to this. I can't recall seeing it, so I can't rate it.