780683 Montre a tact pocketwatch, No. 2878, sold 1815 (gold) (see also 780684-5) by Breguet, Abraham Louis (1747-1823); diam: 5.1 cm; Private Collection; (add.info.: Gold plated movement with gold three-armed balance, six wheel train including the scapewheel, blued steel hairspring, jewelled parachute shock absorption); Photo 穢 Christie\'s Images; Swiss, out of copyright.