I found this oddball of a keyboard, out of some ancient industrial machine or other. I've no idea what it came from, but this one key is impossible.

It says RUB OUT but it's doubleshot. You literally couldn't rub the legend off the key.

Here's the rest of it, if anyone cares. The switches are Cherry MX Black, and sadly there is one cap missing - and of course it would be something important (small Shift key). In a fairly unusual (in my experience) twist, ALL these caps are doubleshot, including the blue ones with diffusers installed for their LEDs.

If anyone recognizes this board, I'd be mildly interested knowing where it came from or what it used to be part of. It's currently gathering dust; I'm not sure what to do with it and that missing key cap kinda kills my interest
