Not a Sei Tacche is it? A lovely piece with a particularly nice case.
Hi DirtyDozen12;
Thanks for your comment. Before researching the term to which you referred, I wouldn't have known a Sei Tacche if it'd crawled up and bit me on the big toe. A quick perusal of the internet referred me right back to our most eminent Omega Forums and this thread which apparently escaped me at the time it was first begun, a most grievous error on my part as I really like vintage Longines and usually read everything to do with the brand.