Model ME033LL/A ipad mini - ipad 2? 3? or 4? or other?

I've had my mini for 2 years -- bought through my phone carrier. I love it, I use it. I wanted to buy a new case for it -- Ordered one and it didn't fit. Figured it was manufacturer defect til I realized I ordered for a mini 4 and apparently there have been some (surprise) changes to it's design...small insignificant ignominious designs.

Anyway, dawned on me that I have no clue WHICH ipad mini I have -- is it 1st generation? ipad 2? ipad3? ipad4? Probably need that before I buy anymore accessories for my device:

Model ME033LL/A

Version 9.3.1 (13E238)

which I got in the "About" section -- is it some sort of joke that every piece of information is provided about this device EXCEPT which ipad it is?

Help please. Thanks!