As far as I remember all the AP royal oaks now produced are 39mm. The older 36mm were all JLC based movements and now are discontinued. Although the new dual time still looks to be JLC based.
I really like some of the 36mm models, especially the week-month-moon model. They're excellent buys in the second hand market.
Quote:
Originally Posted by
zippyh 
This is about 36mm.