Building on the 500 Monopostos auto-centric watchmaker Autodromo dropped last year is the new Prototipo: a ’70s-esque Japanese hybrid design incorporating features of both quartz and mechanical movements. Starting with a sloping 42mm brushed steel case, the Prototipo recalls the prototype racers of the early ’70s and pairs a quartz crystal movement with a mechanically-powered chronograph, a discrete date window and tachometer, and pulsometer scales along the slim bezel. Available in either black or white, the standard Prototipo is joined by the Prototipo Vic Elford Limited Edition – named for the legendary Porsche driver – which sports an aesthetic reminiscent of Elford’s Porsche 907 thanks to a white and yellow dial, the car’s number 224 at the 12 o’clock position, a caseback engraved with a map of the Targa Florio circuit, and an autographed 44-page booklet. The black and white Prototipos retail for $625 USD while the special Elford model is limited to just 224 production models at $775 USD each. All three are now available directly from Autodromo.