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Hamilton 770 Hairspring


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Hey,

I'm on the lookout for a Hairpsring for a Hamilton cal 770. I've managed to find out that it's a Breguet made from Elinvar but that's about it. 

Does anybody know the parts number? If you also know where to get hold of one it would be very appreciated.

Thanks!

/A

Edited by B3stia
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Cousins has it as obsolete, but there is a complete balance with hairspring for a Hamilton 770 on ebay US now as well as a complete movement which is listed as having a good balance

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3 minutes ago, Tmuir said:

Cousins has it as obsolete, but there is a complete balance with hairspring for a Hamilton 770 on ebay US now as well as a complete movement which is listed as having a good balance

Thanks Tmuir. I had completely missed the balance on sale. I will ask my watchmaker if it will do.

I think I want to stay away from used movements as long as possible. 

 

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On 12/18/2017 at 9:30 AM, B3stia said:

Thanks Tmuir. I had completely missed the balance on sale. I will ask my watchmaker if it will do.

I think I want to stay away from used movements as long as possible. 

 

I have two #770 movements with good complete working balance's if you pay the shipping you can have one free.

20180812_210244_resized.jpg

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    • You could remove the crystal and fit the bezel first.    Or, try it like you have if it’s not too much force required to press - acrylic crystals can take a lot of pressure if it is correctly applied near the edge. 
    • That balance has a different number of screws, a different number of hairspring coils and a significantly different stud location.    It could have the hairspring accidentally fitted 180 degrees around, or it could be from a different caliber. It’s unlikely to be the former if it is NOS as it would be roughly adjusted for beat-error in the factory. 
    • There is a chance is from the same family with different build, some manufacturers use the same wheel over a few models. Do as  Nucejoe suggests and move the balance spring into position to match the old one. Also check the balance rim for a stud index mark it may have been placed on wrong in the first place.
    • It’s a different model of balance wheel. 
    • Despite sameness of caliber, hairsprings might not interchange.  Each hairspring was vibrated with the wheel it is on. I just turn the new hairspring by 180 degrees.  If you happen to take the hairspring off of the wheel you have a chance to brush the hell out of the balance, usually chemicals like  one dip is used to clean hairsprings, you should in no way attempt cleaning H/S physicaly. You might soak the hairspring in lighter fluid overnight for a good clean. Save the old balance complete to re-staff. Good luck
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