NOMOS Glashütte Tetra 27 duo

The NOMOS Tetra 27 duo, reference 410.GB, has a square steel case measuring 27.5 x 27.5 mm. The hand-wound DUW 4001 Duo calibre has up to 53 hours of power reserve behind a sapphire crystal case back. Light gray areas mark the minute track and centre of the white silver-plated dial, with tempered blue hands. The case is 6.4 mm thick, spans 38.5 mm lug-to-lug and has 18 mm between the lugs. NOMOS rates the case to 50 metres. The leather strap is black Horween Shell Cordovan.