The Seiko 93A is a robust and reliable quartz analog chronograph movement known for its precise timing and user-friendly functionality. Introduced in the late 1990s, the 93A was designed to provide accurate stopwatch capability alongside traditional timekeeping features. It has been widely used in Seiko’s sporty and casual watches, offering chronograph functions without compromising on durability and ease of use.

Technical Specifications

• Caliber Number: 93A

• Movement Type: Quartz (Analog)

• Functions:

  • Hours, minutes, and central seconds hands

  • Chronograph: measures elapsed time up to 60 minutes

  • Small seconds sub-dial

  • 24-hour sub-dial (some versions)

  • Date window (usually at 3 or 4 o’clock)

• Chronograph Accuracy: 1/5 second increments

• Battery Type: SR920SW (1.55V silver oxide)

• Battery Life: Approximately 2 to 3 years

• Jewels: None (electronic quartz movement)

• Crown Positions:

  • Position 0: Normal operation

  • Position 1: Date adjustment

  • Position 2: Time adjustment

Key Features

Chronograph Functionality

• Measures elapsed time up to 60 minutes with 1/5 second accuracy.

• Chronograph seconds hand is usually the large central hand.

• Sub-dials display elapsed minutes and running seconds.

• Stopwatch is started, stopped, and reset using pushers.

Timekeeping

• Standard hour, minute, and seconds hands provide reliable time display.

• Quartz movement ensures consistent accuracy and low maintenance.

Date Display

• Date window generally positioned at 3 or 4 o’clock on the dial.

• Quick-set date function via the crown.

Operating Instructions

Time Setting

1. Pull the crown out to second click (Position 2).

2. Rotate the crown to adjust the time.

3. Push crown back to Position 0 to resume normal operation.

Date Setting

1. Pull the crown to first click (Position 1).

2. Rotate the crown to set the date.

3. Push the crown back in after adjustment.

4. Avoid adjusting the date between 9 PM and 3 AM to prevent damage to the date mechanism.

Chronograph Operation

• Start/Stop: Press the top pusher to start and stop the chronograph.

• Reset: Press the bottom pusher to reset the chronograph hands to zero after stopping.

• The chronograph seconds hand sweeps smoothly, reflecting 1/5 second increments.

Battery Replacement and Maintenance

• Battery type: SR920SW silver oxide battery.

• Typical battery life: 2 to 3 years depending on usage, especially chronograph use.

• Battery replacement should be done promptly when the chronograph function becomes erratic or timekeeping slows.

• No reset procedure is generally required after battery replacement, but chronograph hands may need manual realignment by a watchmaker.

Maintenance Tips

• No lubrication required for quartz electronic components.

• Avoid strong magnetic fields and severe shocks.

• Regular cleaning of case and bracelet maintains appearance and water resistance.

• Water resistance should be tested annually if watch is used in wet conditions.

Watches Using the Seiko 93A

The 93A movement has been featured in many Seiko chronograph watches, primarily in the:

• Seiko Sportura line

• Seiko Chronograph collections

• Casual and sports watches with robust cases and sporty dial layouts

• Models featuring stainless steel cases, sometimes with tachymeter bezels

Summary Table

Conclusion

The Seiko 93A quartz movement is a dependable and precise chronograph caliber well-suited for those seeking accurate stopwatch functionality paired with reliable everyday timekeeping. Its smooth 1/5 second chronograph timing, durable design, and straightforward operation make it a favored choice in Seiko’s sports and casual chronograph watches. The 93A continues to demonstrate Seiko’s commitment to quality quartz chronographs offering great performance and value.