Rare. Vintage. Large wall clock by Howard Miller. Designed by George Nelson. Model 6223. Shown in the Howard Miller Clock Co. Institutional Division Catalogue, N0.31-i-23 on page 20. Part of the 6200 series of Institutional Clocks. Measures 18" in diameter and 3.5" deep. Aluminum case "with convex acrylic shatter proof crystal." White painted case with black hour and minute hands and red second hand. Electric Motor.