Casing: steel with hood made of Wolfram-carbide hard metal Sapphire crystal, flush crown, bolted steel base with sea horse logo, 35 x 42.5 mm Strap: original, NSA, steel, maximum circumference 20 cm Dial: satinized metal, beige glaze, logo and brand overlaid, articulated anchor logo, luminous dots Movement: ETA 2783, gold-plated, 25 stones, date adjusts between 20 and 24, watch functions flawlessly and precisely Rado begun the era of the scratch-resistant casing with the Diastar. Wolfram-carbide is extremely tough and is used in the construction of stone drills. Casing and sapphire crystal are practically scratch-proof, unless you happen to have a diamond with you.