Antide Janvier No

Antide Janvier No. 153, circa 1789. Very important month-going mahogany travelling regulator with remontoire and special dead-beat escapement. Solid mahogany, with moulded base and pediment, spring-loaded glazed front door, designed to be easily transported with a recessed folding handle on the top. The movement and the pendulum are mounted on an "L" shaped solid mahogany bracket which can be slid out of the travelling case, its base, set with a pendulum guard and a spirit level, is inlaid with a brass screwed plaque, engraved: "Régulateur No. 153 - Echappenient libre perfectionné". White enamel with Roman numerals, outer Arabic minute ring and gold inlaid dots as five minute divisions, signed "Coteau" below "30". Gilt brass fine and elaborate hands and counterpoised blued-steel centre-seconds hand. Brass, spring driven, with a double frame, the larger for the extra large going-barrel, surmounted with a shaped lower one for the train of wheels and the delicate spring remontoire, which is controlled by a fly regulator. Set on the back plate of the lower cage, the most unusual escapement, based on the pivoted detent escapement, allowing a dead-seconds beating hand with a half-seconds beating pendulum (a small pivoted and spring loaded lever with jewelled pallet, operates as a pivoted detent acting on the pendulum as it swings in one direction only, the impulse given via a small roller). The nine rod grid-iron, half-seconds beating pendulum with spring blade suspensi