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I think a simple answer is; An unbreakable mainspring is a Lifetime mainspring.

Another noob question, a forum search (surprisingly) turned up nothing. I think I'm searching wrong... :(

What is an "unbreakable mainspring"?
What is a "lifetime mainspring"?

I have seen this printed on the dial of some old watches. I am pretty sure I saw them on regular manual wind watches, so the wikipedia entry which says that this is an "automatic watch" feature doesn't make sense to me.

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