Charles Edouard Guillame was the one who discovered Invar and Elinvar, nope they're not islands, but nickel based alloys that could withstand magnetic fields allowing a wrist watch to be accurate. Other alloy-based materials have Glucydur and Nivarox who were key by watchmakers in the 1950's.Besides using alloys, permanently of producing non-magnetic watches is to use an incredibly conductive material to store the movement in the case.
As mentioned previously it had become Vacheron Constantin that first developed these watches; in 1915 they introduced the first anti-magnetic pocket watch. Rrt had been then as well as Tissot's non-magnetic wristwatch in 1920, therefore the first anti-magnetic chronograph by Vacheron Constantin in 1954.
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Replica Rolex GMT-Master Watches
