Hail:
I am looking for the ancient IBM 1386887 (3179 terminal) keyboard, US qwerty.

Why, well, few reasons: these monsters have a very tough spring system, typing on these 'is hard', which is what I need, I blast away typing, waking often my wife a floor higher (I literally HAMMER my keyboards to shreds).
Further on, I need the extra 12 function keys, so I can program much used functions to them.
And lastly, this beast, weighing a decent 2 kilograms (4.4 pound), which makes the keyboard a tough piece to smack an idiot with, in case they annoy me.

Thank you aforehand.
Ben