Charles Edouard Guillame was the one that discovered Invar and Elinvar, nope they are certainly not islands, but nickel based alloys which will withstand magnetic fields allowing a wristwatch to stay accurate. Other alloy-based materials add Glucydur and Nivarox that were widespread by watchmakers during the 1950's.Apart from using alloys, permanently of producing non-magnetic watches has been a conductive material to house the movement in a case.
As said before it was Vacheron Constantin that first developed these watches; in 1915 they introduced the 1st anti-magnetic pocket watch. That it was then and then Tissot's non-magnetic wristwatch in 1920, and then the first anti-magnetic chronograph by Vacheron Constantin in 1954.
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