Any information about this item would be greatly appreciated. Which automatic movement should fit in the case? The dial is approx 25mm or 1 inch diameter. Thank you very much.

 

one more.

 

This should help http://omegaforums.net/threads/need-help-identifing-movement-for-omega-case.10585/

 

Cal. 684 it is.

Cheers, Al