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Both movements, despite the fact that https://v.gd/WXH9YV link they are world's record holders, are constructed using pretty traditional https://v.gd/vFQkQK link watchmaking methods and materials – steel, brass, jewels; some beryllium alloys https://zzb.bz/gkpxvD link in the 920, and of course, Nivarox for the balance springs and Glucydur for the balances.
