The case band in reinforced with a 1.5 mm metal ring, as is the case back flange. Installation of the back required very high pressure in a case vice, a bit unnerving with a plastic watch. The automatic movement is the surprise in the Swatch, if only because it actually works . The finish of the movement, of course, is absolutely basic. With the exception of the wheels, pinions, arbors, and jewels, there is not even a hint of polishing on even the most critical parts such as the balance or escape lever.
All parts are in the most basic, functional form.
This wheel, of course, turns more slowly than the first reduction wheel because of reduction by the first wheel. Given the construction and finish of this movement, its performance is nearly a miracle. In disassembling the movement for photography, there appeared to be very little lubrication. On extended measurement, the movement actually averaged a beat error of zero and showed a maximum error of 0.3. This is a nearly flawless trace.