Seiko Grandfather Tuna limited edition ref. SBDX005, complete set

The Seiko SBDX005 was released in December 2000 as the final model in Seiko’s seven-piece Historical Collection, a limited-edition series celebrating the brand’s landmark watches at the turn of the millennium. Paying homage to the 1975 “Grandfather Tuna” 6159-7010 — the world’s first titanium dive watch — it faithfully revives the model’s distinctive ceramic-coated titanium shroud and robust 51mm case, preserving the iconic Tuna silhouette while offering modern construction and enhanced durability. Powering the watch is the hand-assembled Seiko caliber 8L35, derived from the Grand Seiko 9S55 and produced at the Shizukuishi Watch Studio in Iwate Prefecture. Produced in a limited run of 1,000 pieces, this model remains one of the most sought-after Tuna watches in Seiko’s long history.

This watch is in excellent condition, showing light signs of wear from modest use. This watch was freshly serviced by Seiko in July 2025, receiving a full movement overhaul. At the owner’s request, all original components were retained and the case was left unpolished in order to preserve its originality. Additional photos are available on request.

This watch comes as a complete set with its original boxes, instruction booklet, and guarantee card. Please note that the serial and case numbers were left blank on the card. It was serviced by Seiko Watch of America in July 2025 and is accompanied by the service documentation from the original owner.

Brand: Seiko

Model: Historical Collection “The Year 2000”

Reference: SBDX005 or 8L35-0030

Year: 2000

Case size: 51mm

Lug-to-lug: 51mm

Case thickness: 17.4mm

Case material: Titanium

Dial color: Black

Movement: Seiko caliber 8L35, based on the Grand Seiko caliber 9S55

Complications: Date

Water resistance: 600 meters

Strap/bracelet: Seiko black rubber strap (DAL1BP)

Lug width: 22mm