Lot 521

Technicum Cantonal Bienne, Case No. 930, 59 mm, 161 g, circa 1910
A heavy graduate's work "master piece" of the watchmaking school Biel - a deck chronometer with spring detent escapement according to Thomas Earnshaw and original mahogany box
Case: silver. Dial: enamel. Movm.: bridge movement, large gold screw Guillaume compensation balance.

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