Seiko 6138-0020T “UFO” Chronograph [44mm] Automatic

A cult favourite among collectors, the Seiko 6138-0020T—popularly known as the “UFO”—is an iconic automatic chronograph from the 1970s. With its distinctive 44mm tonneau-shaped stainless steel case and dual-register dial, this watch embodies Seiko’s golden era of mechanical innovation.

The UFO’s large case wears comfortably thanks to its rounded design, and the dial is a standout: matte black with contrasting orange chronograph hands and dual sub-dials (12-hour and 30-minute). The inner rotating tachymeter bezel, recessed sub-dials, and English/Spanish day-date display all add to its purposeful vintage charm. Powered by Seiko’s in-house 6138 movement—renowned for its vertical clutch architecture—this piece offers both automatic and manual winding functionality.

Key Features:

• Model: Seiko 6138-0020T “UFO”

• Movement: Seiko 6138 automatic chronograph (manual + automatic winding)

• Dial Size: 44mm

• Case: Brushed stainless steel, tonneau-shaped

• Crystal: Hardlex mineral

• Functions:

  • 12-hour chronograph

  • Day-date complication (English/Spanish)

  • Tachymeter bezel (inner rotating)

• Pushers: Dual pump-style chronograph pushers

• Bracelet: Stainless steel aftermarket jubilee-style bracelet

• Lug Width: 19mm

• Case Back: Screw-down, marked “Water Resistant” and “Japan”