Vintage 1910-1920 Edwardian Art Deco Sterling Silver Guilloche Powder Blue Collar Pin. This beauty is comprised of sterling silver fashioned in to an oblong open work collar pin or bar pin....embellished in guilloche enamel....a beautiful shade of robins egg blue on Sterling Silver. Pin is stamped on the reverse.... Hampleve Sterling and other English hallmarks. Has a c-clasp that works well. Weighs 6.5 grams total weight. Pin measures 2-1/2 inches wide and a little over 1/4 inches high In EXCELLENT vintage condition.