The Seiko 6138 “UFO” is one of the brand’s most distinctive vintage chronographs — a bold, helmet-shaped case wrapped around Seiko’s legendary in-house automatic chronograph movement. Produced in the early to mid-1970s, the reference 6138-001X combines a bi-compax layout with an internal day–date display, wide baton hands, and a deep black dial with cream sub-registers that have aged attractively over time.

This example shows heavy patina across the tachymeter bezel and expected wear on the case and crystal, but the dial retains its depth and character. The 6138 movement is intact, and the watch comes fitted with its period-correct Seiko bracelet — a desirable detail for collectors. Despite the cosmetic wear, the watch remains an authentic and compelling slice of Seiko’s mechanical chronograph history.

A true collectible from the era that established Seiko as a serious chronograph manufacturer, prized for its bold case shape, dual-register layout, and robust mechanical engineering.

Key Features

• Iconic Seiko “UFO” helmet-shaped chronograph from the 1970s
• Powered by the in-house Seiko 6138 automatic column-wheel chronograph movement
• Black dial with cream dual sub-registers (minutes + hours)
• Day–date complication at 3 o’clock
• External tachymeter bezel with heavy vintage patina
• Original Seiko stainless-steel bracelet included
• Thick, brushed stainless-steel case with integrated lugs
• Strong collector interest due to distinctive design and mechanical heritage
• Honest vintage wear across bezel, case, and crystal