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no one has mentioned the DuraPower mainspring made from Elgiloy by Elgin which was guaranteed for 450 years, which you could say is "Lifetime".
Though, to be fair, Elgin was out of business and unable to fulfill the guarantee within 23 years of the introduction of the Durapower mainspring, so it's as useful as the lifetime guarantee on the Durabalance. ;-)
 
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