Swiss ETA 7750 Issue

[pokerpot]

Here's a new one I haven't seen before, maybe someone can help.

Had a gen ETA 7750 put into my SA. The 12 hour chrono hand runs on it's own when the chrono is not running. If I hit the bottom pusher, it will reset every time but then after 15 minutes or so you can see it begin to creep again.

Any ideas what could be causing this please?

[RWG Technical]

Who did the installation of the ETA 7750?

This should have been picked up during the testing after installation, my suggestion is to send it back and have them correct the problem.

It's an easy fix most of the time, any competent watchsmith should be able to figure out the problem.

RG