MITKA

Service: Longinges Ultra-Chron calibre 341

IMG_0094 The Ultra-Chron were fitted with calibre 340 and was Longines entry to the High beat race of the late 1960’s.  This watch is fitted with a 341 that also features a date mechanism. The serial number says this watch is from 1968. It’s in very good condition, but is not running. I’m suspecting that the mainspring is broken.
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Movement is a bit dirty, but very nice.

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The 340 series have nice movements, but I don’t see the need of a loose oscillating weight washed and bush.

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I remove the autowinder mechanism.

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Here you can see the inside of the autowinder mechanism.

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The movement without the autowinder mechanism.

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Movement out of the case and I’m about to remove the hands and dial.

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Dial and hands removed and you can see the date mechanism. Nice construction that has a very snappy date change.

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Date mechanism cover plate removed revealing more of the date mechanism.

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I start taking the base movement apart.

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Here you can see the gear train layout.

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Movement almost taken apart.

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Hmm is that an invitation to open the barrel?

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As suspected the mainspring is broken.

P1030503

All the parts cleaned and ready to be put back together.

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The cap jewels are tiny.

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I fit a mainspring that is close to the original: 0.95 x .15 x 340 x 11.2

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Movement looks so much nicer when clean.

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I put the setting/ winding mechanism back in place.

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I put the autowinder mechanism back together.

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Date mechanism back together.

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Movement back in the case looking very nice!

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The mainspring was spot on and I’m happy with the performance of the 36.000 beat pr hour movement. 

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I now fit the oscillating weight.

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Watch in fantastic original condition.

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The 37mm case is almost too large for my wrist, but still feels very nice.

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