The Art of American Horology Part ll,...

Roosevelt Hotel, Madison Avenue @ 45th Street, Dec 04, 2002

LOT 631

Waltham Watch Co., Waltham, U.S.A., No. 23170203, Model 1908, Grade "Vanguard", circa 1919.Fine, yellow gold-filled, keyless, 23-jewel Railroad watch with a 24-hour winding indicator and a Lossier inner terminal curve.

USD 5,500 - 6,500

C. Three-piece, "bassine" by "Keystone" using J. Boss patent, screwed bezel and back, back engraved with a train against engine-turning. D. Triple-sunk white enamel with painted bold Arabic numerals, outer minute ring, subsidiary sunk seconds, 24 hour up-and-down indicator below 12 o'clock. Blued steel "Spade" hands. M. 16 size, nickel, 3/4 split plate with mocked bridge, damascened, 23 jewels, the top ones in gold settings, straight line lever escapement, cut bimetallic compensation balance witgold screws, adjusted to 8 positions, blued steel Breguet balance-spring with Lossier inner terminal curve, Ohlson's patented micrometric regulator, lever-set.Signed on dial and movement, engraved on ratchet wheel "Lossier Inner Terminal Hair Spring".Diam. 51 mm.


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Grading System
Grade: AA

Very good
Case: 3

Good
Movement: 3*

Good

Overhaul recommended, at buyer's expense
Dial: 3 - 13 - 01

Notes

Louis Lossier was a director of a horological school in Geneva. In 1890, he published "Etude sur la théorie du réglage des montres" in which he included patterns of hairsprings satisfying Phillips' isochronism equation.