It's a 16753, 7 million (1982/83??). The dial was replaced by the seller I think - not too sure of it's heritage.
Anyway, just got it decked out with a oyster bracelet after some searching. Still not code perfect. Long story short, I bought a TT sub 16803 and it came with a 93153 bracelet but a 93150 clasp oyster lock. At the ame time, I bought a used 78363 oyster bracelet (I think this is relevant only for the DJ) and it came with 93153 clasp (go figure!)
So now I have a TT sub that is code appropriate but a GMT that is well .... a lot more comfortable to wear I guess
Here is the GMT with the 78363/ 93150 oyster bracelet
And the 16803