I think one of the challenges with this piece would be the crystal. I believe the internal Tachy ring is part of the crystal design. (Don't know that for sure). If I recall, there was one NOS for sale on chronotrader forum recently. Do a search for it. Case is rough, and unfortunately I don't know if it could be refinished (not critical). Sub-dial hands may have been repainted. Cal.11 movement would likely need servicing. $375 - $500 (depending on possible parts/repair). There was some Crowns on eBay, but pricey. Depending on your price range, you may want to wait for a better example. I'd anticipate putting at least $750 into this for crystal ($300 ish) and service. So at $2300 you may get one in better condition via a auction. Hope info helps your decision. Good luck. Jeff