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On October 15, 1940 Hamilton introduced the 992B, also an Elinvar hairspring. All watches were fitted with that spring which was 36% nickel steel.

Source: Collecting Watches by Shugart and Hanson
 

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Those of us who own Seiko Monsters also have hairsprings made from this rustless alloy. Even early Rolex's used Elinvar!
 
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