Thoughts about this cal 283?

It would be interesting to hear if the experts feel that movement is original to the chronometer dial. It's not marked as adjusted and doesn't have a special regulator. That doesn't mean it's wrong, but I'd say it's worth investigating.

I have my doubts about this one.

Calling @mac_omega who literally wrote the book on 30mm Omegas.

https://omegaforums.net/threads/omega-chronometer-book-cal-30-mm.146737/

Not loving this one. Too many questions at that price.
gatorcpa

First of all the size provided by the seller is wrong because he included the crown in his measurement. I wonder that a watch dealer does not know how to measure correctly. Maybe he wants to lure potential buyers by the larger size...
Correct size is 35 mm

This is one of the examples I call "UK-Chronometres". Several have emerged after the release of my book, so I have not included them in my book nor have I been able to discuss them in detail.
These watches are somewhat mysterious, labeled as chronometres, but have no particular finish on the movement and no mention of any special adjustment for the chronometer specifications.

My research in the Omega archives was unsuccessful because the part of the microfilm on which the relevant serial numbers could be found is missing. This part of the microfilm was probably destroyed in the course of a breakdown (crack, fire, etc.). This means that neither the authenticity nor the original condition of these watches upon delivery can be verified. One would have to try to find order slips, invoices or delivery notes in other written documents in the archive that could provide precise information about the delivery of movement/dial units to the UK. Due to the infamous scandal surrounding the 2915 Speedmaster, no outsider can now access the Omega archive for research. This would now have to be done by archive staff, but they are severely understaffed and understandably have no time for such extra requests. So all that remains is the hope that one day I will be allowed back into the archive (if I can still live to see it). Or that one of the employees will find the time to search through the mass of old documents themselves (I have little hope!). Until then, purchasing such a watch remains a highly speculative venture, but one should always remember the sayings about Omega: “Never say never” and “Who dares…”.

condition of the presented watch:
polished case
later replacement crown
dial with quite visible pitting
I would like to see facetted hands (and maybe a blued second hand)
the present second hand is heavily oxidised/pitted

It is interesting to hear that this may be a legit combination. My first guess would have been movement or dial swap since there is nothing special about the movement suggesting chronometer-ness, but if Mac says it might be straight, it might be straight. Even if legit though, the asking price is way over the top IMO. I'd blanch at paying half that, even from a dealer.