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Cheers Greg ChalkCvanwhite at aol dot com
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alwaysiwc Wrote:.....The answer is provided by Christian Niemann, master watch maker at IWC and responsible for the world wide specific service information. quote-"The movement of ref. 5425 is based on the cal. 9820 Pocket Watch Movement. The thermometer is a bimetallic coil which is fixed on one end to the main plate and on the other end to an arbor (axe). With the rising of temperature the coil expands and when it is cooler, it will shrink. As one end is fixed to the main plate and the other to the arbor, the arbor will rotate. On this arbor a hand is mounted which will transfer the rotation on a temperature scale"-unquote.For watch technicians such coil is exactly the opposite of what the most important coil must do in a a watch: the balance spring should not, or as little as possible react to temperature changes, otherwise the watch will gain or lose time.Ref. 5425 in yellow 18 kt gold with cal 9824 movement was only available during 1981 and 1982. The price was 16.500 Deutsch Marks, the price of a Mercedes car in those days....Kind regards,Hans-Georg Aberle,Rolf Birkenkämper,Thomas Koenig,Adrian v d Meijden (alwaysiwc).
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