Another XBOX ONE Controller (Model 1537) Version EV5-B prototype, this one has a hand written label stating "Trigger Demo" "E3 - FW v149" these were early examples of the final first generation XBOX ONE controllers from 2013.
An early XBOX ONE Protype dated around 6 months before the final hardware revision, this motherboard is reused from even earlier units that had zebra stripes.
The motherboard still retains debugging functions at this stage.