Yours has just been worn, mine did just sleep in a drawer for decades. For me it is important that there is no polishing, and I have already seen 18k Cosmics polished to death, no indication of any letters on the case back, ugly edges. etc.
Love your dial (which has certainly not been changed), and still.. a 18k Cosmic is rather rare.
Also check your crystal, I hope your watchmaker used a legit one (if changed). You can tell by the Omega logo in the middle.
Let me try if I can show you...
.. I think you can see it on those pictures.
