[Product Information]
• Model: SEIKO CLASS 923 Dr. Yellow 20th Anniversary Commemorative Watch.
• Common reference: Seiko 8T63-based “Doctor Yellow” Collaboration Chronograph.
• Series: Seiko Spirit / Railway Collaboration Chronograph.
• Collaboration: JR West × Shinkansen “Doctor Yellow” Class 923.
• Type: Limited edition quartz chronograph watch.
• Release era: around 2021–2022.
• Limited production: 5,000 pieces.
Case & build
• Case size: approx. 47 × 39.8 mm.
• Thickness: approx. 12.8 mm.
• Case material: Stainless steel.
• Band: Stainless steel bracelet.
• Glass: Curved Hardlex crystal.
• Water resistance: 100 m / 10 bar.
• Tachymeter bezel functionality.
• Chronograph pushers styled in sporty instrument-watch format.
• Made in Japan.
Design concept
• Created to celebrate the 20th anniversary of the 923 Series “Doctor Yellow” Shinkansen inspection train entering service.
• Bright yellow dial inspired directly by the iconic Doctor Yellow bullet train body color.
• Dial and case-back feature Class 923 Dr. Yellow train graphics and commemorative markings.
• Case back engraved with “20th Dr. Yellow,” train illustration, and individual limited-edition serial number.
• Designed as a crossover between Japanese railway culture and enthusiast chronograph watch collecting.
• Delivered in a special commemorative presentation box themed around the Doctor Yellow train.
Functions
• Analog quartz chronograph timekeeping.
• Chronograph / stopwatch function.
• Tachymeter scale.
• Date display.
• Small seconds subdial.
• Luminous hands.
• Sport chronograph dial layout.
Power
• Quartz chronograph movement.
• Seiko Caliber 8T63.
• Battery-powered operation.
• Meca-quartz style chronograph architecture used in many modern Seiko chronographs.
Key highlights
• One of the most collectible modern Japanese railway-themed Seiko collaborations.
• Celebrates the famous “Doctor Yellow” diagnostic Shinkansen train beloved by railway enthusiasts in Japan.
• Limited production of 5,000 pieces increases collector appeal.
• Bright yellow dial makes it visually distinctive compared with standard Seiko chronographs.
• Strong crossover appeal among train collectors, anime/Japan culture fans, and Seiko enthusiasts.
• Original complete sets with commemorative packaging are increasingly difficult to find outside Japan.