Seiko Sports 100, Ref. 7A48-7000, Cal. 7A48, Men’s Quartz Vintage Watch, 1984

Vintage Seiko Sports 100 Quartz Vintage Watch from 1984, men's chronograph timepiece powered by the Japanese Cal. 7A48 movement. Featuring a moonphase complication and elegant Roman numeral dial, this refined collectible is fully serviced and for sale in excellent condition.

Seiko Sports 100 1984 — First impression - 7A48-7000

Released in the mid-1980s, the Seiko Sports 100 reference 7A48-7000 remains an iconic representative of early quartz chronograph innovation. With its sophisticated moonphase display and classic Roman numeral markers, this model combined high-precision Japanese horology heritage with elegant design. The fully stainless steel construction, accented by gold-tone crown and pushers, gives it both durability and refined aesthetics. Its place in Seiko’s history is secured as one of the pioneering quartz chronographs with multi-function complications, highly sought after among collectors.

Seiko Sports 100 - Roman numeral moonphase Dial

The dial is a harmonious silver-white tone with printed Roman numerals, a design choice that elevates its classic character. The upper subdial hosts the moonphase aperture, beautifully executed with a dark blue sky and gold moon detail. Subdials at 9, 3, and 6 o’clock track chronograph minutes, tenths of a second, and running seconds respectively. All markings are crisply printed, ensuring excellent legibility without cluttering the dial.

Sports 100 7A48-7000 - Hands

The timekeeping hands are slim black batons, precisely contrasting against the dial for optimal readability. The chronograph seconds hand extends to the tachymeter scale for accurate timing, while the subdial hands maintain a uniform style. Their balance between elegance and functionality reflects Seiko’s 1980s design philosophy.

Seiko Sports 100 7A48-7000 - Stainless Steel Case

The case measures 39 mm in diameter and 41.5 mm lug-to-lug, crafted from stainless steel with a combination of brushed and polished finishes. Gold-tone pushers at 2 and 4 o’clock enhance the watch’s visual appeal while providing responsive chronograph operation. The refined case geometry sits comfortably on the wrist, balancing sportiness with dress versatility.

Sports 100 7A48-7000 - Crown

Positioned uniquely at 8 o’clock, the gold-tone crown is original and era-correct, allowing for easy moonphase and calendar adjustment. Its placement and coloring create a distinctive visual balance against the pushers.

Seiko Sports 100 Stainless Steel Bracelet

The integrated stainless steel bracelet features horizontally brushed links with polished edges, flowing seamlessly into the case. This bracelet design contributes to the watch’s unified aesthetic while ensuring a secure and comfortable fit.

Movement — Seiko Caliber 7A48 Quartz Chronograph with Moonphase

The Seiko Cal. 7A48, introduced in the early 1980s, was the world’s first analog quartz chronograph with a moonphase complication. It operates with remarkable precision and durability, hallmarks of Japanese quartz engineering. The movement includes a 15-jewel construction, independent pushers for chronograph functions, and accurate moonphase tracking. This caliber’s historical importance cannot be overstated for quartz watch evolution.

Heritage of the Seiko Sports 100 in the 1980s

The Sports 100 series represented Seiko’s push to combine sports durability with advanced complications in the quartz era. In the 1980s, the moonphase function was rare in quartz chronographs, making the 7A48-7000 a landmark. Collectors prize these models not only for their technological significance but also for their timeless design, which bridges sports utility and formal elegance. For those exploring Seiko vintage watches with moonphase and chronograph heritage, this reference is a must-see.

Seiko Sports 100 — 12-Month Warranty, Worldwide Shipping

This example is in excellent vintage condition, fully serviced and tested for accuracy. All components are original, ensuring authenticity for serious collectors. The watch comes with a 12-month warranty and is eligible for worldwide shipping. Enthusiasts of vintage chronograph watches with moonphase complication will appreciate its blend of precision and historical charm.