This is the Case Back Crystal Gasket fitted to the 3573.50 FIRST AND ONLY WATCH WORN ON THE MOON steel case back 145.0811.
These are Omega supplied gaskets for the 3573.50.00.
Omega Speedmaster Case Back Crystal Gasket for 112ST1589
Items can only be returned if either faulty, in the case of the item not being required then it must be returned exactly as received. For example if the item is new in a sealed packet and/or has protective covers in place then it must be returned the same otherwise item is no longer new and the value is greatly reduced, these items can only be returned/refunded by agreeing a lower value with Swiss Limited Editions before returning reflecting the new lower value of the item.