Dial has no lume, and the movement bridge is normally ed Heuer signed. Could be a transitional bridge perhaps. Pushers may also be later (hard to be sure originals are smaller than all other screwback case Autavia) and crown is later...and try and find the original domed one...impossible.
The seller is known and trusted and is not trying to cover anything up, it is all there for you to see. Whatever its issues it's still a 1st exec 2446 and has a lovely bezel it's just not in as "original condition" as the prior one on eBay. Suspect it may still go for £22-25k level.