Seiko Chronograph "Dr. Yellow - Class 923 20th Anniversary Limited Edition" (Ref. 8T63-01E0 / No. 1316/5000)

This special edition was released for the 20th anniversary of the legendary Shinkansen test train "Class 923 Dr. Yellow" – a symbol of Japanese engineering and precision. The model was produced exclusively for the Japanese market and is limited to 5,000 units.

The present item is in new, unworn condition, complete with original box, papers, warranty card, protective foils, and two spare links. It is a complete full set, which is extremely rare to find today.

Technical Data

• Model: Seiko Chronograph – Dr. Yellow 20th Anniversary (Class 923)
• Reference: 8T63-01E0
• Limitation: 5,000 pieces (No. 1316/5000)
• Movement: Seiko Caliber 8T63, Quartz Chronograph (1/5-sec. measurement, 60-minute counter)
• Functions: Chronograph, 24-hour display, Date, Tachymeter
• Case: Stainless steel, polished/brushed
• Diameter: 41 mm (without crown)
• Height: 12.8 mm
• Lug-to-Lug: 47 mm
• Lug width: 20 mm
• Weight: 112 g (incl. stainless steel bracelet)
• Crystal: Hardlex crystal
• Water resistance: 10 bar (100 m)
• Bracelet: Stainless steel bracelet with security folding clasp + two spare links
• Condition: new, unworn, with protective film, full set
• Origin: Made in Japan

Background: The "Dr. Yellow" – Japan's legendary Shinkansen Test Train

The Class 923 Shinkansen, better known as "Dr. Yellow", is a technical masterpiece in Japanese railway history. Since its introduction in 2001, it has served as a rolling measurement laboratory, collecting data on track geometry, pantographs, signal quality, and power supply during high-speed runs.

The striking yellow livery harks back to maintenance trains of earlier eras and gave the train its nickname. Due to its irregular deployment schedule, seeing the Dr. Yellow is considered a sign of good luck in Japan – many railway enthusiasts regard it as a symbol of precision, safety, and technical excellence.

For the 20th anniversary of the Dr. Yellow, Seiko created this special edition – a tribute to speed, precision, and Japanese engineering.

Design and Special Features

• Luminous yellow dial in the color of the real Class 923
• Blue chronograph hands and black subdials as a homage to the train's details
• Engraving on case back: "20th Anniversary Class 923 Dr. Yellow" with train outline
• Tachymeter bezel – functional reference to the theme of speed
• Special packaging: yellow anniversary box with train illustration and inscription 20th Anniversary Class 923 Dr. Yellow

Market and Collector Valuation

This edition was exclusively available in Japan and sold out completely in a short time. Due to its thematic depth and iconic color scheme, it is now one of the most sought-after Seiko themed models of recent years.

• Rarity: high (hardly available outside Japan)
• Condition: new / Full Set / with protective films
• Design: luminous collector's item with iconic color scheme
• Collector's value: increasing – especially in complete, unworn condition

 

Warranty (used)
This is a used item. The limitation period for claims for defects (statutory warranty) is 12 months from delivery.