Rolex GMT 'Fat Lady' - wassat?

[FarQue]

I see there's a GMT for sale in the classifieds. It's described as a 'fat lady'. Any clues for the uninformed as to what this refers to? I'd call the black and red bezel a 'coke' bezel, but maybe I'm wrong?
Thanks in anticipation...

[Arun_D]

Seems to suggest it's due to a beefier case, bezel and crown guards

http://doubleredseadweller.com/gmt_transition.htm

[FarQue]

That explains it. Thanks!

[GCH]

Bigger case....to me, its not as nice as the slimmer ones (next on my hit list), but then I have smaller wrists.