LADY'S 18K YELLOW GOLD, COBALT GUILLOCHE ENAMEL AND DIAMOND OPEN-FACE PENDANT WATCH,by The James R. Armniger Co., Baltimore, circa 1900. Reverse has a cobalt enamel with inner border of matched old mine cut diamonds; front has old mine cut diamond surround; white enamel dial with black Arabic numerals and pierced gilt hands. - D: 1 1/8 in. Estimate $500-700