FP Journe, Very Rare and Fine Chronometre Optimum, Platinum Constant Force Remontoire, Circa 2012 Case: 42.5mm, platinum, three body case, with exhibition caseback attached by screws, No. 052-CO Dial: white gold and silver dial, with aperture to view wheel of the constant force remontoire Movement: FP Journe Cal. 1510, 18k rose gold movement, 44 jewels, natural deadbeat second on back of movement, parallel mainspring barrels, 3 HZ frequency, constant force remontoire, 240 components. Band: crocodile leather on FP Journe signed platinum buckle Signed: FP Journe on case, dial, movement This timepiece is accompanied by its original outer and inner presentation box, and documentation The Chronometre Optimum represents a tour de force of technical achievement and holds yet another "world's first" from the haute horology manufacture. Cased in 42.5mm platinum, Cal. 1510 is a twin barrel, constant force remontoire with F.P Journe EBHP escapement and natural dead beat seconds, which is visible from the case back. Never before has such a complication been offered from any manufacture capable of high complication production.