Black on both sides so I guess mine is a rev 1I wouldn't worry too much and just enjoy it. Which color do you have ?
Black: Rev 1 in black leather had a black leather outside and black lining too. Rev 2 had a beige lining. Rev 3 is same as Rev 2 but with added stitching.
Beige: Rev 1 of the saddle brown band never existed but got a first autumn 2015 release with a beige lining. Rev 2 also has added stitching.
Hope this helps
Black Rev 1 http://justnowupdates.blogspot.nl/2015/06/classic-buckle-band-for-apple-watch.html and http://www.imore.com/classic-buckle-band-apple-watch-review
Saddle brown rev 1:
https://forums.macrumors.com/thread...ase-with-saddle-brown-classic-buckle.1914654/ and https://superphen.co/2016/01/30/rev...assic-buckle-15-us-itunes-gift-card-giveaway/
