There was talk some while ago in the shooting press (possibly airgunner or airgun world) of the Omega being re-launched, from memory about 3 years back so would have been Turkish. It was only about a column inch, no photos, and I don't think I saw anything subsequently. Maybe the likes of troubledshooter can shed some more light.
I assume yours has a stamped 6-digit serial number, probably starting with the number 7 or 8? If it's in decent enough condition (ie stock ok...) £120-£150. If un-repairable, second hand woodwork does appear on that auction site for the Omega every now and again.