PATEK PHILIPPE HORA OFICIAL EXTRA OBERVATORY QUALITY DISPLAY CLOCK
Patek, Philippe & Cie., Genève, No. 198081, case No. 609804. Movement made in 1913 and
cased cica 1932.
Very fine and rare, chromium-plated keyless "EXTRA" adjusted deck lever Chronometer with
Guillaume balance and stop feature destined for Observatory Timing Contest in original fitted
wooden box. Accompanied by the extract from the archives.
Three-body, drum type, polished, stop push-piece at 4 o'clock.
Heavy, solid, matte silver, black painted baton indexes, outer minute track, subsidiary
seconds. Blued steel "spade" hands.
47 mm. (21'''), gilt brass, 21 jewels, movement double stamped with Geneva hallmark,
wolf's tooth winding, straight-line calibrated lever escapement, anibal-brass Guillaume
balance with special alloy Breguet balance spring having inner and outer terminal curves,
"swan-neck" micrometric regulator.