Essentially a CK 2173 Medicus with the caliber R17.8 SC rather than the caliber 23.4 SC. This is a US delivery watch which may account for the different movement/reference combination. Crisp stainless steel screw back case, with fabulous stepped bezel and faceted lugs, waterproof crown appears to be original. Note: the inside edge of the case back is NOT chewed up you are seeing the led gasket. Original dial with cool fancy hands. Caliber R17.8 SC movement, just serviced. 30.6-mm excluding the crown x 37.7-mm and supplied on a new leather strap. $695.00, PayPal and US shipping included, international shipping OK, cost by location. *
Watches delivered to the United States have movements marked OXG, which is Omega's designated import code. Simply because the manufacture found it to be the most practical movement to use for a given case size.