So, how is the ethos of USM expressed in the limited edition chronographs? Quite deftly and subtly, in fact. Housed in the distinctive, angular, 14-sided, and instantly recognizable Defy case, sized at 37 millimeters in diameter, four dial colors are offered as part of the limited edition set, which will see just 60 of each being produced. Called “gentian blue, pure orange, golden yellow, and (USM) green,” they represent some of the original colors USM used in the Haller line, beyond black and white. To be sure, USM, like many a Swiss watch brand, has been slow, conservative, and methodical in updating its products. When it recently added olive green to its color lineup, it marked the first new shade for the Haller furniture system in more than two decades. Marietta says Zenith’s dial makers couldn’t simply use a Pantone reference for the dials but had to create special pigments to match USM’s unique paint hues.