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Description

I am pleased to offer from my private collection this extremely rare antique Invar Chronometer Masonic pocket watch c1920's in excellent original condition!
The watch has a solid 18k gold Art-Deco case.

The watch has the highest grade Invar caliber ever made-a lever chronometer with precision regulator,Invar balance,Breguet spiral,maximum jeweles set in Gold Chatons.

Fine enamel dial depicting Masonic symbols,original hands and crystal.
46mm
47 grams heavy
The watch comes with the original leather purse.

Perfect working order,reacently serviced.

The Invar Watch Co. was founded in 1901 by Achilles Hirsch in La Chaux de Fonds,named after the invar material used in balance.
Invar was invented in 1896 by Swiss physicist, Charles Edouard (acute on 'E') Guillaume, but he was only internationally recognized for the discovery in 1920 when he received the Nobel prize for physics, encouraged by the improvement in scientific instruments that the use of Invar had allowed. Invar has proved to be an incredibly useful alloy and is used where high dimensional stability is required, such as precision instruments, clocks, seismic creep indicators, TV shadow-mask frames, valves in engines, and antimagnetic watches. I have not so far mentioned the useful antimagnetic properties of Invar, but in combination with high dimensional stability, these make for an excellent material to be used in the manufacture of hair springs and certain other components in mechanical watches. Indeed, the bi-metallic balance in watches that had been the previous method of controlling accuracy for temperature variations could now be replaced by solid Invar.

It comes with a Certificate of authenticity.

Free shipping to worldwide by DHL overnight courier.