Seiko 5717A – Technical Guide

Introduction

The Seiko 5717A is a manual-winding chronograph movement, introduced in 1964 to commemorate the Tokyo Summer Olympics. It was Japan’s first domestically produced chronograph wristwatch, making it a milestone in Seiko’s mechanical development history. The 5717A featured a single-pusher operation, a central chronograph seconds hand, and an integrated 30-minute counter in later models (5719).

Most famously, the 5717 powered the Seiko Olympic Chronograph ref. 5717-8990, a clean, minimal chronograph without sub-dials — designed for functionality, legibility, and durability.

Technical Specifications

Key Features

Monopusher Chronograph

The 5717A uses a single pusher to control all chronograph functions:

• 1st press: Start

• 2nd press: Stop

• 3rd press: Reset

This streamlined approach simplified operation, although it lacked the ability to pause and resume (lap timing).

Chronograph Seconds Only

The base 5717A does not include a 30-minute counter or sub-dial. Instead, it features:

• Central chronograph seconds hand

• A clean dial without complications (aside from optional date window)

• In later variants (5719A), a 30-minute totalizer was added

Optional Date Function

Some 5717A watches include a date window at 3 o'clock:

• Quickset is not available

• Date advances once every 24 hours at midnight

In watches with no date, the movement structure remains nearly identical, minus the calendar parts.

Winding and Operation

• Manual winding only — no automatic rotor

• Smooth winding with moderate resistance

• Fully wound in approx. 25–30 turns

• No hacking function

• Time is set by pulling out the crown to position 1

Historical Context

The 5717A debuted during the 1964 Tokyo Olympics and was worn by Seiko officials and some Olympic staff. Its precision and rugged simplicity made it a trusted timepiece during one of Japan’s most iconic international showcases.

It paved the way for Seiko’s future chronograph innovations, including the Cal. 6139, the first automatic chronograph with column wheel and vertical clutch (1969).

Servicing and Maintenance

Lubrication Points

• Pallet fork, escape wheel, center wheel pivots

• Chronograph cam and hammer contact points (light oil only)

• Mainspring barrel and gear train jewels

Common Issues & Solutions

Watch Models Using 5717A

Most notably:

• Seiko 5717-8990 Olympic Chronograph

  • Released in 1964

  • No sub-dials

  • Central chronograph hand

  • Some models include date window

  • Stainless steel case, sunburst dial, external tachymeter bezel

Also closely related to:

• Seiko 5719A – which adds a 30-minute chronograph counter at 6 o’clock

Summary Table

Conclusion

The Seiko 5717A is a piece of horological history — Japan’s first mechanical chronograph movement, launched during a pivotal moment in Seiko’s global rise. Though it lacks modern chronograph complexity, its simplicity, durability, and historic significance make it a highly collectible movement. Restoring and preserving a 5717A watch today is not only a celebration of mechanical ingenuity but also a tribute to Seiko’s bold entrance onto the world stage in 1964.