Name: Antique Silver Pocket Watch WWI British Army Officer's Award Invar c1916
SKU: 326276227240_7784_7CC2
Availability: InStock

Antique WWI British Army Officer’s Award Invar Silver Pocket Watch c1916

Description

I am pleased to offer from my private collection this rare antique WWI era military British army officer’s award silver Invar Grand-Prix pocket watch c1916. Fine enamel dial. High grade movement. 46mm

We gives 2 years guarantee free service for the watch!

History 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.