OK, I found my spare 1900 mainspring (and a little something extra). I will take some photos this evening and post them in a new thread.
That is a pretty hefty price for those Swiss mainsprings. They are pretty specialized and not a piece of cake to make, but that still seems like a premium price. Certainly glad I do not need one.
Ron
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If it's made after 1918...it's a reproduction
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