Few people have heard of it, yet many consider John Blankenbaker's KENBAK-1 to be the first commercial personal computer.

Koss introduced these headphones over 40 years ago, and they remain affordable favorites to this day.

Wristwatch Roundup: Belt Drives & Slot Machines

Magnificent watches

The 'Net has recently been abuzz with some awe-inspiring watch designs. Let's start our roundup by taking a belt-driven model for a spin. The TAG Heuer 'Monaco V4 Concept Watch' [via Gizmodo] was produced in a limited run of only 20 units. It uses a series of thirteen tiny drive belts measuring a mere 0.5x 0.45 mm and relies on the "world's first" linear-oscillating mass: a 4.25-gram platinum ingot.

If you prefer games of chance, try your luck with the bewilderingly complicated Girard Perregaux '1945 Jackpot Tourbillon,' unveiled last week at the Geneva SIHH show: "...this hautegadget has an actual miniaturized mechanical slot machine just above the hands and tourbillon. Each roller has five symbols , hearts, diamonds, spades, horseshoes, and three liberty bells for jackpot. When the arm on the side is pulled, the spin also activates a striking mechanism of chiming gongs - for those vintage casino sounds." [via The Watchismo Times]

Finally, allow me to introduce the Vacheron Constantin 'Saltarello Jump Hour.' This $28,900 (pre-owned) timepiece was produced in a limited edition of only 200 pieces. The sparse face features a jumping-hour display above a retrograde minute hand that belies the beauty and complexity of its Caliber 1121 36-jewel movement. Finishing touches include a skeletonized and engraved central rotor and 21 karat gold mass. [thanks, Cotter!]


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