zOwie Omega Discussion Forum

I asked Omega about the movement int the GMT, and how to use a winder. I thought y'all would be interested in their answer:

Thank you very much for your eMail. We are pleased to hear that you wear an Omega watch and thank you for the confidence placed in our brand.

Please find on the below lines the answers to your questions:

1) Your GMT caliber 1128 winds up bi-directional.

2) I did not calculate the ratio oscillating weight - barrel (which must be made to have a 100% correct result). But it is known that in a modern watch movement this proportion is about 120-1. This means, that 120 revolution of the oscillating weight produces one revolution of the barrel.

The barrel, to be fully wound up, needs about 7 revolutions. This way, 7 multiplied with 120, gives a result of about 840 revolution (of the oscillating weight). The watch, when is unwind, has to accomplish about 840 full revolutions to be fully wound up.

3) Modern automatic watches, such as Omega caliber 1128 can not be over-winded. The mainspring is a so called slip-spring, which means that the end of the spring that is in contact with the barrel wall slips always a little bit further (un-winds a little) when the energy is too high or before the movement is over-winded.

We remain at your full disposal for any further information.

With kindest regards,

Omega Ltd.

Peter Saunier Technical Assistance