By just looking at the back of a band? you sir, should take that skill on the road....
You can tell by the gold tone (Rolex Presidents are only made in precious metals) and the fact that the bracelet is the Hidden Clasp design. If you look close enough, there's a raised Rolex crown logo on the back which is the clasp.
Just got in a presentation box of Dormeuil Ambassador super 180s. Very tempted to do an iconic dove grey suit in that cloth for myself.
Would you be able to comment on the usefullness of such a cloth? I've read that the real lifetime of such a suit would be in the hours of use but it's hard to judge where these comments are coming from. It seems odd that a factory would make a item that is almost doomed to annoy the end user. Would such a cloth be better for a sports coat? Most of the 180-200's I've seen on the net are in such a way they lean towards a suit.