Three Hamilton Open-face Watches

Three Hamilton Open-face Watches, "921" no. H5095, "992" no. 1062629, "940" no. 234621, the "921" with silver-tone dial with applied arabic numerals, stem-wind, stem-set, 21-jewel movement, in a 14kt gold case, dia. 44 mm, 57g, the "992" with double sunk Montgomery dial, stem-wind, lever-set, 21-jewel movement, in a Hamilton 10kt gold-filled case, dia. 51 mm, "940" double sunk arabic numeral dial, stem-wind, lever-set, 21-jewel movement.