Orchi believes these are Rolex Ref 16750 GMT Master Dial Variants..

Err buddies...in here Orchi wishes to highlight the
Rolex Ref 16750 GMT watches n its Dial Variants in here...
for comparisons n further references that you might have on
the subject matter...

Thanks for your participation...

Best regards
Orchi.

The continuation of the remaining article about
the Rolex Ref 16750 GMT Master watch Dial variants...
can be found in the TRF or the VRF as well...

http://www.rolexforums.com/showthread.php?t=77719

http://www.network54.com/Forum/207593/message/1240995126/Orchi+believes+these+are+Rolex++Ref+16750+GMT+Master++Dial+Variants..%2Bpics.

Pic Courtesy of Buddy John Donaty in VRF Dial Archive...