dunno what CMO is but have read in germany some stuff about the different displays...
but i know I have a S, [R] and another with no letter on it. So what that is...I dont know. they all work fine, show me the right colours and I have nothing to complaine about.
they all have standart setup with no colour calibrations
edit: Did I say something like I have a CMO Display? :)
well since you said something along the lines that you had them all ...
as long as you don't have a "C" version in the hidden menu (which means the panel is built by "CMO", "S" is for Samsung, "A" for AU optronics, the reste are unknown and probably of the next 226BW generation which hides the origin of the panel in the hidden menu because of all the fuss about it.)
read more about it in the link I provided earlier if you want ;)
even more detailed info on this link : http://www.behardware.com/articles/667-1/samsung-226bw-a-and-s-series-the-verdict.html
Agent999: you might want to check out that link, just to be sure.