After spending a little time on the forum and looking into PO in various sizes, I kind of got used to looking at the serial no. And came across this 42mm 8500??

 

And the question is?

 

8500 divided by 3 is 2,833.333, so it would seem to be true.

 

When I put in the reference number, it brings up 45mm watch not 42mm?

 

I believe there was both sizes. So someone may have listed it for sale.

 

The ref. you provided is clearly for the 45.5 mm watch:

https://www.omegawatches.com/de/wat...an-600m-omega-co-axial-45-5-mm-23230462101003

 

He was clearly advertising it as a 42mm

I messaged him saying the reference number brings up 45.5mm and not 42mm.

He since has removed it from ebay