Grade 429

Sometimes called 429 special. Bridge model, nickel plates, pedant set, fine sapphire hole jewels, polished visible winding wheels, one piece recoil spring click (different type on later produced), micrometer nut and regulator, raised jewel settings, double roller escapement, steel escape wheel, handsomely damaskeened, adjusted to temperature, isochronism and four positions, tested on half time without a hair spring, accurately rated, carefully timed and tested after being cased. Total production 93350.