No full pictures yet, sorry, maybe over the weekend. Something about developing some forum and work eating up all my time..
The Sega HTR-2106 came with the Sega Teradrive
, a "16-bit PC with an integrated Mega Drive, manufactured by IBM for Sega (...) only released in Japan."
The keyboard is also made by IBM for Sega, and has a unique Alps switch. More about that later. This is no ordinary Alps switch!
Unfortunately the LED area arrived with a hole in it. I think the seller ripped me off, because it would be hard to get that kind of damage during shipping through an otherwise undamaged box and undamaged foam. It's only the LED sticker, but it would be hard to fix, IBM LED stickers are bigger and slightly differently colored.
I took these for my shopping service, and they returned that they couldn't see anything wrong, if I would be so kind to encircle or point to the exact problem. So I did.