15 May 2006
Hans Bergmann. A fine and attractive 18K white gold openface perpetual calendar keyless lever school masterpiece watch with phases of the moon
Signed Hans Bergmann, Bern, No., circa 1978
With nickel-finished fully jewelled lever movement, bimetallic compensation balance, the silvered matte dial with applied baton numerals, silvered dauphine hands, four subsidiary dials indicating month combined with leap year indicator, day, date and phases of the moon combined with constant seconds, in plain circular case with snap on back, case and dial signed
52 mm. diam.
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A masterpiece is a watchmaking complication a watchmaker has to be able to construct in order to be recognised as a master watchmaker.
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