Swiss. An 18K gold open face split second chronograph
No.10356, Retailed by Tiffany & Co., New York, circa 1900
Adjusted jeweled movement with chronograph work and split mechanism visible on bridges, activated by buttons in crown and band, bi metallic balance with overcoiled spring and micrometer regulator, gold cuvette, white enamel dial with fifth seconds track enclosing arabic chapters, blued hands and gilt split hand, subsidiary seconds, within a plain gold case, signed by retailer on case, dial and movement. 47 mm diam.