Chronograph pushers

[Sukh13]

I was playing with an IWC watch today and the owner said not to press the reset pusher if the stop watch was going as it could jam the movement?

Why would that be?

Surely the manufacturer would put a device in that would prevent that?

[eccles]

I've got several vintage chronographs with different movements which leads to pushers doing different things on different watches. I've never had any trouble when I've pushed the wrong button at the wrong time.

[Sukh13]

So I guess he was just being careful? He said that he got he information for the dealer upon buying his watch. I think the movement is based upon the 7750 as it is the IWC 3789