RedHotJazz.com has 2 recordings of CONEY ISLAND WASHBOARD, both made by The Five Harmaniacs on Sept 17 1926. Members of the Five Harmaniacs were Ned Nestor, Clyde Shugart, Wayne Durand, Jerry Adams, and Walter Howard—the first 4 of whom were credited as composers of the song. However, their recordings don't have a vocal—except for some scat singing and kazoo playing.

There are numerous videos of various performers doing CONEY ISLAND WASHBOARD at YouTube.com, but none of them seems very old.