A FINE & RARE 18K SOLID GOLD ZENITH MOONPHASE CALENDAR CHRONOMETRE POCKET WATCH MADE FOR ZENITH BY THOMAS ENGEL, CIRCA 1983, LIMITED EDITION OF APPROX 30 PIECES, IN ITS ORIGINAL BRASS INLAID WOODEN BOX D: Silver Guilloche regulator type dial with a 60 minute centre hand, three subsidiary dials displaying day, hours, continuious seconds & moonphase. M: 17 jewel manual wind lever movement with "swan neck" regulator, signed Zenith Chronometre. C: Screw back case with Guilloche design, Zenith case makers mark, hallmarked 18k, numbered, case diameter measures approx. 50mm excluding the neck and bow.