Extended II. Durable mechanical keyswitches, excellent tactile feedback, washable (dry thoroughly before next use ;-)

The height adjusting slider actually works, if the plastic mechanics get some appropriate lubricant (like a small amount of washing-up liquid, preferably spread onto the disassembled slider with a brush).

Btw: did anyone successfully transplant the controller of a recent USB keyboard into an Apple Extended keyboard II ? Thus you would not have to work around missing keys like with ADB-Keyboard + Griffin iMate.