Chronograph help please!

[MattWatch]

Hi All,

So I've just picked up this lovely old Chronograph from the 60s. It's the first mechanical chrono I've owned so this may be user error, but:

The large second function doesn't reset to exactly 12. In fact, it resets further round the dial each time (it's currently round to the 2 marker)

The large second function will stop at random, which stops the whole movement.

What's going on ere then?!

If I could upload an image without it failing every time I surely would..

[qhartman]

Good advice here: https://mb.nawcc.org/threads/resetting-chronograph-hands-to-zero.58491/

Based on your description, I think you have two things going on. The sweep is probably loose, which is why it's inconsistent. As far as the whole watch stopping, that probably just needing a clean and lube, but it's also possible the sweep is interfering with something that's causing it.

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