This little gem is something I saw on ABC, waaaaay back around '71 or '72. I know it aired several times in those days,around Christmases('71-'74)in prime time, and on their experimental but short-lived "Wide World of Entertainment".(At the time, there were two animated versions of this story. One was the CBS version which was an hour and, had traditional open-line art for the animation, including a skull-faced Jacob Marley.) This version miraculously managed to squeeze the entire story into 30 minutes and was out and out scary. The animation looked like an old etching, come to life with lines moving everywhere to indicate shadow and form. London became a creepy, Gormenghast-like city with spires, and arches, all sort of in this weird forced perspective. I remember the gap-mouthed Marley with his jaw dropping down to the middle of his chest as he screamed at Scrooge, and the eerie candle-headed Ghost of Christmas Past whom he forced back into a large cone that one would put candles out with in those days(but smaller). Creepy stuff even for it's time. Worth finding.
