Vianney Halter Antiqua Perpetual Calendar, Originally released in 1998 and produced in extremely limited quantities with only 11 pieces produced in the configuration seen here. Beautifully patinated 18k yellow gold case consists of more than 130 individual pieces and takes 900 man-hours to manufacture, on a strap with a yellow gold tang buckle, automatic Vianney Halter caliber VH198 perpetual calendar movement, 35-hour power reserve, signature riveted porthole design with 104 rivets made from solid gold, silver dials feature painted black markers and blued steel hands, separate apertures for the time, date, day, and month with leap year, display back with patented "mysterious mass" rotor, sapphire crystals, size: 40mm x 46mm (including lugs), thickness: 11mm. Excellent condition with original Vianney Halter guarantee/instruction booklet that was hand signed by Vianney Halter himself showing an original date of sale in March of 2005. A truly exceptional piece of independent watchmaking history.