Has anyone any idea about this 'St Christopher'??

I don't.
This one is in Christies' catalog for the 11th may auction :


As far as I've seen until now (in real, period advertising and different books as AJTT), the 1937 Omega St Christopher has been produced with a rotating bezel and a caliber 23.4SC inside. This one has a fixed bezel, but also has a supporting Omega archive extract. I suspect that the watch has been modified with a replaced non rotating bezel and not checked by Omega who, as susual, only consulted caliber and case serials to issue the certificate. The second model depicted in AJTT has a 30T2SC, a different medalion design, a different case shape and is presented as a local production, probably French, very different from this watch.
Surprisingly also the hands of this watch are thinner than the usual 'plume' ones that were on the original 23.4SC 1937 St Christopher wit hrotating bezel.

Your opinions? Does anybody know something about a third St Christopher design that would not be in AJTT?

And the description says the case is 32mm where the St Christopher I know with rotating bezel is 28.5mm...
Strange however for Christie's to have let this watch in without further research and explanation if they found it to be genuine.

That's why I was thinking about a replaced bezel (rotating changed to a fixed one a t some time). But the 32mm diameter remains a mystery, except if they include the crown...

When does the extract date from? Remember pre 2010 extracts are questionable

Christie's does not give the certificate date in its catalog.

Christie's get EOA for each watch before each sale, so they must be recent.

Strange because extract for this listing says ref CK2041 and the one for the 2015 listing, with what seems to be a similar case says ref CK2083.
2041 is the ref for the rotating bezel, I have no details on 2083.