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Auktionen Dr. Crott 91st Auction

200* Sigmund Riefler, Munich, Movement No. 89, Typ D, DRP No. 50739/100870, Height 1375 mm, circa 1904  An important tank precision regulator - Type D - with Riefler spring impulse escapement - sold to “Warner and Swasey Observatory” of the “Case Institute of Technology”in Cleveland and delivered in 1906 Case: air pressure constant glass tank with glass dome, precicion mercury barometer. Dial: silvered, inlaid radial Arabic 0-23 hour indicator at “6”, auxiliary seconds at “12”, brass bezel, half-moon control window for electrical winding system, blued spade hands. Movm.: rectangular brass 4-pillar movement, first quality, matted, gilt, screwed platform with Riefler’s gravity escapement and adjustable knife edge suspension for pendulum on agate discs, Invar nickel/steel compensation pendulum No. 726 - Type J, with aneorid and attached plate to put on weights. Sigmund Riefler 慕尼黑 — 意義深遠的精密擺秒壁鐘,型號 D,Riefler設計的彈簧重力擒縱,在1906年送交 Cleveland的”Warner and Swasey Observatory”天文台的 “Case Institute of Technology” (錶殼技術中心) 40057  C: 3, 30, 32 D: 2, 8 M: 2, 30  50.000 - 100.000 EUR 55.100 - 110.100 USD 450.000 - 900.000 HKD