Vintage Watch | Seiko Quartz Chronograph 7A28-706LT Speedmaster with Signature Outer Ring

Seiko 7A28-706LT: Quartz Revolution Icon with Signature Outer Ring

Dive into one of the most important chapters in modern watchmaking with the Seiko 7A28-706LT. Launched in the early 1980s as part of Seiko’s groundbreaking Sports 100 series, this reference stands out with its distinctive outer ring—perfect for quick tachymeter readings or countdown timing. It captures the same innovative spirit that made the 7A28 family a true challenger to the Omega Speedmaster, but in a sleek, accessible quartz package that still feels fresh today.

The World’s First Analog Quartz Chronograph

The 7A28 movement, introduced in 1980–1981, was Seiko’s bold statement: quartz didn’t have to mean cheap or disposable. Instead of plastic modules, Seiko built a full-metal caliber with 15 jewels, four independent stepper motors, and genuine serviceability. This wasn’t just accurate—it was engineered to be repaired and regulated like a fine mechanical watch. The 706LT variant highlights this engineering with its practical outer ring, giving owners an extra layer of functionality for motorsport timing or everyday use.

Precision That Still Impresses

At its core sits the legendary 7A28 caliber—rugged, all-metal, and built for longevity. It delivers a 1/20th-second chronograph hand, 30-minute register, running seconds sub-dial, and the clever split-seconds function activated at 10 o’clock. The outer ring adds real utility, whether you’re timing laps or simply appreciating the sporty, purposeful look. Decades later, these movements remain highly regarded for their reliability and repair-friendly design.

Distinctive 1980s Character

The 7A28-706LT features a stainless steel case with Seiko’s signature hooded lugs and a commanding yet wearable 38.5 mm profile. The outer ring gives this example a more tool-watch edge compared to plainer siblings, creating strong visual contrast and enhancing legibility. Clean markers, sharp hands, and that purposeful bezel ring combine for a watch that feels both vintage and surprisingly modern on the wrist.

A Smart Choice for Collectors

As one of the earliest and most technically ambitious analog quartz chronographs ever made, the 7A28 series has earned serious respect. Military-issued versions, film cameos, and its serviceable movement have built a dedicated following. The 706LT’s outer ring makes it a standout within the lineup—functional, eye-catching, and increasingly hard to find in strong condition.

Our Offering

We’re excited to present this Seiko 7A28-706LT in good vintage condition. Recently serviced by our trusted watchmaker in Japan, the movement runs accurately with all chronograph functions operating smoothly. The stainless steel case shows light, honest wear that adds character without detracting from its appeal. The watch crystal have no scratches on it. It comes fitted with a period-correct steel bracelet (long and versatile for most wrists) that enhances the authentic 1980s tool-watch vibe.

More than a reliable daily wearer, this is a genuine piece of horological history—Seiko’s confident answer to the quartz crisis, now ready for its next chapter.

Specifications:

• Maker: Seiko
• Model: 7A28-706LT
• Era: 1983 June 
• Case Diameter: 38.5 mm
• Lug to Lug: ~41.5 mm
• Lug Width: 20 mm
• Case Condition: Lightly worn stainless steel with preserved original finishes
• Crystal: Clean original mineral glass with no scratches at all
• Dial & Ring: Sharp dial with distinctive outer ring (tachymeter/countdown style)
• Movement: Seiko 7A28 quartz chronograph, fully serviced and running strong
• Bracelet: The watch comes with the original Bracelet that can fit most wrists