It looks like it definitely is to me but is this a genuine vintage Omega Geneve? http://www.ebay.co.uk/itm/252518976295?_trksid=p2055119.m1438.l2649&ssPageName=STRK:MEBIDX:ITPurchases made through these links may earn this site a commission from the eBay Partner Network
Looks fine for a late 60's / early 70's model. I wish we could see the inside of the caseback to confirm the UK hallmarks.