Diastar

The Rado Diastar holds a unique place in watch history as the world’s first scratch-resistant watch, introduced in 1962. Its distinctive oval case, crafted from hardmetal (a tungsten-carbide alloy), set a new standard for durability and design. Collectors are drawn to early Diastar models for their innovative use of materials and their unmistakable mid-century aesthetic, which stands apart from anything else in Rado’s lineup.

Reference numbers like R124 and R123 mark the classic 35mm models, with subtle differences in dial layouts, bracelet styles, and movement upgrades over the years. Earlier examples often feature automatic ETA calibers, such as the Caliber 2789, prized for reliability and period-correctness. Later variants introduced quartz movements and minor cosmetic tweaks; mechanical versions generally command higher prices, especially those with original dials and signed crowns.

Condition is the main driver of value, as the hardmetal case resists scratches but can show chips or loss of gloss with heavy wear. Originality matters: collectors look for unpolished cases, period-correct bracelets, and untouched dials. While the Diastar isn’t plagued by rampant counterfeiting, replacement parts—especially crystals and crowns—are common, so verify these details if authenticity and collectibility are priorities.