COMPARATIVE LITERATURE:
Derek Roberts, Mystery, Novelty and Fantasy Clocks, Schiffer, 1999, p.266, fig.22-31b; Sotheby's New York, The Joseph M. Meraux Collection of Rare and Unusual Clocks, 28 June 1993, lot 58.
Six column beam engine clocks are rare; the example illustrated in Roberts and Meraux has four pillars.