Expertise needed - JLC Reverso Duo authenticity

So I'm about to pull the trigger on my first Reverso, the Reverso Duo face. I really love this model, but would like this forum's opinion. I've had good input from folks who have purchased from this site (http://www.thegoldenswan.com/shop/ja...-q2718410),but the back of the case picture is causing me pause as it appears to be completely blank. In researching these, I know there are supposed to be engravings to show "Reverso" the serial number, brand, etc. The seller tells me it's just the angle and lighting, so I've requested an additional picture to verify, but I'd appreciate your expertise on this as well.

Site: Jaeger-LeCoultre, Reverso Duoface, Ref: Q2718410 — thegoldenswan