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Blue hairspring

 

You have an eye for detail, Damo!  Honestly, I don't know why the hairspring in my Midi is blued, and I didn't ask Dirk to make one specifically.  According to the 04.0 specs, the hairspring is Nivarox-1, which is usually silver-colored.  Can the Nivarox alloy be turned blue through heat-treatment? 

I suppose it's possible the hairspring is actually a different alloy (Isovar?) or even that Dirk has used the original hairspring from the vintage GUB movement that served as the 04.0 basis.  Whatever the answer, it's yet another small detail to fall in love with!

Tom

 

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