Waltham Watch Co. P.S. Bartlett Open-face Watch, no. 24630600, two-tone silvered arabic numeral dial with sunk center and seconds, blued Breguet-style hands, stem-wind, stem-set damascened 19-jewel movement, split bimetallic balance with gold timing screws, flat hairspring, and lever escapement, housed in an Elgin Giant 14kt-gold-filled case with small monogram on the back, dia. 45 mm.