Hi Seannie, although the case diameter for the 15202st is 39mm, it fits alot bigger due to the integrated bracelet design and the inflexibility of the bracelet itself. It can "stand" without using any cushion
Best if you can try it in the flesh. I agree the 15202st is not for everybody - some find it too fragile looking due to the ultra thin profile, no quick set date, lack of sweeping hand.
If you could get pass all these it is one hell of a timepiece and it is the closest living relative to the first "A' series 5402 Royal Oak. The proportions is perfect in my book. I am astonished of the art and science of the cal 2121 and is the most beautiful movement I had seen so far (Please pardon my ignorance) I can write more about it but it will become WOT post.
Some enabling pictures!