3) Omega never put hallmarks on the outside of a caseback that I've seen - at least the factory in Bienne didn't. I don't think I've ever seen a brand sanctioned UK / A.L. Dennison case with them, nor any US made (Star, Wadsworth, etc) case either. The only markings you might find are very small gold hallmarks on the side of the case opposite the crown or underneath the lugs. You'll need magnification to identify them since they're so tiny. The engravings on the inside of a caseback are easy to see though.
Click to expand...