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

16818 Views 15 Replies 13 Participants Last post by  GregBV
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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give me a mainspring and I will break it.......

The two terms do, however, seem to mean different things.
'Unbreakable' implies a spring that will not break. It might set and need to be replaced though.
'Lifetime' implies a spring that maintains its shape and the torque it gives out.

Kind regards

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