IWC 3705 Ceramic Flieger Chronograph
In the early days of the Swiss resurgence in watchmaking, IWC was the one of the first luxury watchmakers to experiment with new materials, and they set about creating the ultimate in durable watch cases. Zirconium oxide, a notoriously durable and difficult material was their answer. The 3705, in particular, was made briefly in the 90's, and then discontinued. There's a few different explanations of its short market availability. One explanation is that the zirconium oxide ceramic was just too hard to machine and it was too expensive and difficult to make. Another explanation is that in those days, people felt that black watches just looked cheap. Back then, most black watches were cheap quartz plastic, and nobody wanted a luxury watch that reminded them of a Casio.
Whatever the case, these circumstances conspired to make the 3705 a rare watch, with only about a thousand examples ever constructed, its design drawing inspiration from IWC's rich history with military pilot's watches.