This happens to be my favourite example of the 1163gmt and its the second execution following on from the 1 to 24 bezel. 243xxx serial is what I would expect and the brown dial is a common feature for a lot of these "red needle" examples. I dont believe they left the factor as brown dials but clearly this batch faded more than most. Mine is lighter and I have seen some a milky brown. A nice feature for an already great watch and your example is superb. great find and thanks for sharing.
regards
Paul
www.heuerworld.com