Layout of the typewriter keyboard. The keycaps are lasered (even the spacebar!), several of the "function" keys are blank (although some keyboard models have lids instead).
Centered stems perfectly fitting Cherry switches, sitting just a bit tighter than original Cherry keycaps.
Here is how the typewriter itself looks like (I haven't got one, just ripped off the keycaps at my local fleamarket):
http://www.ebay.de/itm/180735928720