Lookup of iPad Part/Model Number

We received a 16 GB WiFi only iPad along with a large purchase. I'm trying to determine whether it's 3rd or 4th generation. The model number doesn't show up on any of the iPad specs in the MacTracker application. I spent some time looking around Apple support, with no success, trying to find a model and/or part number lookup. If there is one, it's either in-house or well hidden.

The model number is A1395 and the part number is PF493LL/A. Any advice will be very welcome.