This is a gamepad for Nintendo WiiU development.
This aircraft was mainly used for pre-release development, and unlike the retail model, it has a design that was announced at E3 events etc.
These are very rare units and appear to be pre-2011.
A prototype version of the menu is installed.
Only the back shell has been replaced with one from another development machine.
It has been lightly cleaned and confirmed to be energized and touch operation etc.