Important collector's watches, wristw...
Hotel Richemond, Geneva, Apr 13, 2002
LOT 217
Lot of extremely important large Breguet documents, written by himself, related to the construction of gridiron pendulum.
CHF 10,000 - 15,000
EUR 7,000 - 10,000
Five large pages, written, sketched and calculated by Breguet, concerning his research on the gridiron system, with drawings, mathematical formulas and calculations.
