Along with customs, I also restore and sell old keyboards - especially ones like this, that were never intended to work on an IBM-compatible PC, let alone one in 2017.
The Chyron Max is 125-ish keys and 20lbs of steel and plastic, all routed through that tiny, tiny green circuit board you see there in the top right. Originally, it was used to produce television text graphics as a self-contained semi-computer, but now, you can use it for anything you'd like! The switches are Cherry MX Clears, which are firm, tactile, and fairly uncommon. They really make you feel like every keypress matters, and for such a heavily-built keyboard, I don't think anything else would do.
Originally, in that top-right spot, there was a floppy drive, and that's why this one is still in my possession. There's no room left on the inputs of that circuit board, but I swear I'm going to find a way to get a keyboard with a built-in floppy drive working. That's just far too hipster to NOT do.