Cheaper option on eBay - from California - NOS 1976 case but obviously in new condition so maybe not what you want.
Description below:
OMEGA MOONWALK CHRONOGRAPH CASE Ref. 145.022. Circa: 1976. 42mm diameter and 48mm in length. Includes the GASKET, both chronograph buttons, and the original Crystal (with the OMEGA Logo in the center). Produced by Omega in 2003. Unused Omega Factory Moonwalk Speedmaster Case. Needs the back, stem and crown. Don't polish a beat up case, buy this original, and protect the value of your watch!
Click to expand...