vintage unknown, model number 115.0673.3, serial number 10164019, the signed circular black dial, 32mm diameter, with sword shaped hands, orange centre sweep, inner orange hour track and outer minute track with Arabic numerals, quartz movement calibre 115, case, 40mm diameter, bezel in grey satin finished scratch proof ceramic, verso black plastic, with 4 screws, marked RADO DIASTAR SWISS 115.0673.3 HIGH-TECH CERAMICS SCRATCHPROOF WATERSEALED 10164019, to a grey ceramic brick link bracelet with signed titanium deployant clasp numbered 04570, presented in a liveried hard pouch with zip fastenerDuring the 1980s Rado produced their first model using hi-tech ceramics instead of metal for the case and bracelet, and firmly established themselves as innovators in the realm of watch case and bracelet manufacturing. In the late to mid-90s, Rado perfected the use of high-tech ceramics and pioneered two new materials: cermet, a titanium-based ceramic combined with metal, and plasma high-tech ceramics. The latter allowed the brand to produce a variety of products in a range of different colours with a metallic sheen, while still keeping the products hypoallergenic, without any metal. Their cutting edge designs, together with the use of this highly distinctive scratch resistant and durable material (similar ceramic material was used in the construction of the space shuttle) have made Rado timepieces particularly desirable.