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It also depends on the manufacturer, some makers refered to the "white" metal a nickel, chromium alloy with varying amounts of cobalt, molybdenum, or beryllium, as "unbreakable."

Some manufacturers refered to the slipping clutch system used in automatics as "unbreakable" as, at the time (and still, judging from the number of times it comes up here and other watch fora) many people believe too much winding leads to a broken spring. It should be noted that many of these also used the white metal spring material.

Now, most people think of the nickel, chromium, cobalt alloy spring as "unbreakable."
 
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