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That just makes me sad
For 30mm movement watches I'd say 37mm too, but for 50s automatics, 36mm is my threshold. After all, they are larger versions of the more common 34mm (34.5mm for bumpers) cased watches.
The very definition of what makes a watch "jumbo", IMO = a watch that is truly oversize, ie larger than it needs to be and with a smaller cased reference to compare it to
To sum up, “Jumbo” is an arbitrary term when it comes to Omegas 😉
..... but I still think it means 38mm 😁
So by your own definition (which I don’t agree with) 38mm isn’t the largest and is therefor not jumbo, there are 39mm and 40mm references in the dress watch time only landscape.
Although I agree completely with @ConElPueblo’s definition it is OK not to pin down and codify everything in life, particularly when it comes to matters of art and enjoyment.
You may as well police the use of the word “Calatrava” which has often been attached to the word “jumbo.” Some have tried here on OF but it hasn’t slowed down its use outside of our pedant’s paradise.
)I’m neither a dealer nor a collector, if that is what you are asking ? I just research what takes my eye and agree that’s a big proportion of the fun of being into watches 😀
Anyway, back on subject, look at this beauty currently for sale 🥰
Though believe the hands should be painted ?
https://www.shucktheoyster.com/omega-vintage-oversize-calatrava-ck859/