@Avenue @ChrisBlank
I've just picked up what others have taught, reading the Rolex-forums here, on RWI, RG and so on. A lot can be found using the search function either here or on google.
A good "background" to start is this:
http://rwg.cc/topic/142137-gen-rolex-gmt-master-ii-ceramic-vs-noob-rep
Although it's from 2012 and GMTc, the basics are still valid.
Then look at genuine pictures, and Noob v6s and compare to other reps.
Go to a Rolex AD and feel + look at the watch in question.
I'm using the Noob v6s (as the bracelet is almost spot-on) as example and pictures from InTime (since the lighting is excellent!)
Okay, step 1,
The angle & lengths
REP
GEN
^
1) The angle of the "middle link" in the SEL is a bit "higher" and less slope than the case lugs slope ;
2) It is also (of course) longer
^
1) The "outer links" start by following the slope of the case lugs, but then starts declining and has a higher slope around the middle of the distance
REP
^
2) They are shorter
Step 2, tightness and flush
^ The backside should basically sit flush to the case (a little tiny gap, yeah) however the level of the SEL should neither create a "step up" or a "step down"
^ also the gap between the lugs and the SEL should be tight (little light passing through). TC, that makes the classic Sub 11610 matches his SELs/bracelets with different tolerances to create this effect.
However... there is no such thing as a gap-less bracelet.
GEN
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When you think you've picked up what it's all about, check this thread out:
http://rwg.cc/topic/183576-noob-116610-v6s-sel-irregularities
Train that eagle eye. It was hard in the beginning, I didn't understand all the SEL-talk either...
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Also.. I should add. The SEL-fitment is that way on most BPs. It simply has to do with the fact that the BP-bracelet isn't "100%" so... Live with it, or look for a JF / LF-bracelet in the the M2M-ads. I would chose to live with it and accept it's flaws.
Otherwise... The mish-mashing begins, and you will notice how you suddenly have a Noob v3/v6s midcase, gen bezel insert, LF/Noob-bracelet, gen crown, gen crystal, TC LV v2-hands, relumed dial+hands and a big hole in your pocket and spare parts you have no use for.