Seen in an old listing (which I probably missed at the time), a prototype keyboard (tablet) for the Pippin, in its black variant.
How can you tell it’s a prototype given the photo size? Easy: it has a sticker on the back (clue #1), no markings on the inside (clue #2), but most importantly, it features keys with dual markings. Indeed, the keys have both Latin characters and kanji, which is not the case on the commercial black version of the keyboard. In fact, the black version was intended for the American @World console, with its logo and Latin characters only.
In another photo, you can also see a development dongle and a black controller without any markings, so it’s probably a prototype as well.