How to distinguish Nexus 7 (2012) and Nexus 7 (2013) I am having trouble with Bluetooth Low Energy (BT 4.0) on a Nexus 7.  I think I may have a 2012 model.

How to tell if I have a 2012 or 2013 version of the Nexus 7?
There are several physical differences


Most notable is the different orientations of the "Nexus" logo. 
The 2013 model drops the dimpled texture on the back.
The 2013 model also has a camera on the back, which the 2012 model lacks.
The 2013 model has a notification LED on the front, which the 2012 model lacks.
The 2013 model has a speaker grille on the top for stereo sound in landscape, while the 2012 model only has the bottom speaker grille.


2013:



2012: