Seth Thomas tambour, "Sentinel No. 1", ca 1920. This mahogany veneer case is almost perfect, polished and shining, 16.75 inches long, 9.25 inches. The bowed silver dial is perfect, bowed glass in the sash. Full label underneath the case. 8 day, half hour and hour strike on a cathedral gong, inside as clean as the outside, running real well.