18k yellow gold open face split second chronograph by Ulysee Nardin, 52mm. 18k hinged back case and curvette, engine turned back with center engraved with intertwined initials L & C. Case and curvette are signed and are both 18k. Clean porcelain dial with inner black Arabic numerals 1-11 and outer blue Arbic numerals 13-23 & 0, minute/second ring is set in 1/5ths, subsidiary constant seconds register, 30 minute chronograph subsidiary register and the split seconds sweep chronograph hands. Highly jeweled split second chronograph movement in good working condition with serial number 203074. Case, curvette, dial and movement signed.