Filmation’s Marx Brothers?

Thank God for small favors… As far as I know this show doesn’t exist. Fred Grandinetti sent me this trade ad from Broadcasting Magazine (February, 1966) offering a Marx Bros. cartoon package from Filmation. Was there be a pilot? The ad offers a screening, so… could be? This was in the era when Hanna Barbera was producing Abbott and Costello, and Laurel and Hardy cartoons. In light of what Filmation would do to Jerry Lewis a few years later, let’s consider ourselves lucky the brothers Marx weren’t subjected to their cheapjack production methods.