A distinctive vintage Seiko 5 Automatic featuring a deep royal blue two-tone sunburst dial, gold-tone detailing and an original integrated-style two-tone stainless-steel bracelet. The watch features a broad, smooth hooded bezel/case surround that gives the dial a distinctive bullseye-style appearance.
Powered by Seiko’s 21-jewel Caliber 4227, this vintage mechanical movement supports both automatic winding and manual hand-winding. The watch also features a practical day-date display at 3 o’clock and the classic recessed crown positioned at 4 o’clock.
The combination of its unusual case architecture, royal blue dial, two-tone bracelet and vintage Japanese mechanical movement makes this a particularly interesting Seiko 5 for collectors.
Collector’s Note
This Seiko 5 stands out from conventional vintage Seiko 5 models because of its integrated-style case and bracelet design and broad hooded bezel.
The smooth stainless-steel bezel/case surround frames the blue dial and flows naturally into the bracelet, creating a cohesive vintage silhouette. The design gives the watch a distinctive bullseye-style appearance when viewed from the front.
The royal blue two-tone sunburst dial is complemented by gold-tone dot indices and matching hands. Depending on the lighting, the blue dial changes in intensity, giving it considerable depth and character.
Another important collector feature is the Seiko Caliber 4227. Unlike later Seiko automatic movements such as the 7S26, the 4227 supports both automatic winding and manual hand-winding.
The case back is marked 4227-00K0, MADE IN JAPAN, ST. STEEL and WATER RESISTANT.
Specifications
* Brand: Seiko
* Collection: Seiko 5
* Case Reference: 4227-00K0
* Serial Number: 370200
* Movement: Mechanical Automatic + Manual Winding
* Caliber: Seiko 4227
* Jewels: 21 Jewels
* Frequency: 21,600 vph
* Power Reserve: Approx. 40 hours
* Functions: Hours, Minutes, Seconds, Day-Date
* Dial Colour: Royal Blue
* Dial Finish: Two-Tone Sunburst
* Hour Markers: Gold-tone Dot Indices
* Hands: Gold-tone
* Calendar: Day-Date at 3 o’clock
* Crystal: Hardlex / Mineral Crystal
* Case Material: Stainless Steel
* Case Design: Integrated-style case with broad hooded bezel
* Crown: Recessed at approximately 4 o’clock
* Case Back: Solid Screw-down Stainless Steel
* Water Resistance: Water Resistant
* Origin: Made in Japan
* Bracelet: Original Seiko Integrated Two-Tone Bracelet
* Bracelet Material: Stainless Steel with Gold-tone Accents
* Bracelet Reference / End-Link Code: 3250-B-E
* Clasp: Fold-over clasp
* Clasp Marking: SEIKO
Case Dimensions
* Case Diameter: Approx. 35 mm excluding crown
* Lug-to-Lug: Approx. 41 mm
* Case Thickness: Approx. 10.5 mm
* Crown Position: Approximately 4 o’clock
Dial Details
The watch features a deep royal blue two-tone sunburst dial with gold-tone detailing.
The dial includes:
* Royal blue two-tone finish
* Sunburst texture
* Gold-tone dot hour markers
* Gold-tone hour and minute hands
* Central seconds hand
* Day-date display at 3 o’clock
* Seiko branding
* Seiko 5 emblem
The combination of the deep blue dial and gold-tone detailing gives this vintage Seiko a rich and refined appearance.
Distinctive Case & Bezel Design
One of the defining characteristics of this watch is its broad, smooth hooded bezel/case surround.
Rather than using a conventional narrow exposed bezel, the stainless-steel case forms a wide frame around the dial. This creates the distinctive bullseye-style visual effect seen from the front.
The case also transitions directly into the integrated-style bracelet, giving the watch a cohesive appearance.
Case Design Highlights
* Broad smooth hooded bezel
* Bullseye-style dial framing
* Sculpted stainless-steel case
* Integrated-style bracelet connection
* Polished and brushed surfaces
* Recessed 4 o’clock crown
* Compact vintage proportions
Movement Highlights
The watch is powered by Seiko’s Caliber 4227, a vintage 21-jewel mechanical movement.
Movement Specifications
* Caliber: 4227
* Jewels: 21
* Frequency: 21,600 vph
* Power Reserve: Approx. 40 hours
* Winding: Automatic + Manual
* Functions: Hours, Minutes, Seconds, Day-Date
The movement can be wound automatically through wrist movement and can also be manually wound through the crown.
This manual-winding capability is an important characteristic of the 4227 and distinguishes it from later Seiko automatic movements such as the 7S26.
Day-Date Function
The day-date display is positioned at 3 o’clock.
The calendar provides both day and date information while maintaining the classic Seiko 5 dial layout.
The 4227 movement supports calendar adjustment in addition to its automatic and manual winding functions.
Case Back Details
The watch features a solid screw-down stainless-steel case back.
The visible markings include:
SEIKO
370200
WATER RESISTANT
MADE IN JAPAN
ST. STEEL
4227-00K0
The 4227-00K0 marking confirms the case/reference configuration.
The serial number 370200 indicates July of a year ending in 3 under Seiko’s traditional serial-number system.
The serial number alone does not definitively establish the decade, so the exact production year should not be stated as confirmed solely from the serial.
Original Two-Tone Bracelet
This example is fitted with an original Seiko integrated-style two-tone bracelet.
The bracelet combines stainless-steel construction with gold-tone centre accents, complementing the gold-tone detailing on the dial.
Bracelet Details
* Brand: Seiko
* Type: Integrated-style bracelet
* Material: Stainless Steel with Gold-tone Accents
* Reference / End-Link Code: 3250-B-E
* Clasp: Fold-over
* Clasp Marking: SEIKO
The original bracelet is an important part of the watch’s overall vintage character and completes the integrated case design.
Made in Japan
The case back is clearly marked MADE IN JAPAN.
For collectors of vintage Japanese Seiko watches, the combination of the Made in Japan marking, vintage 4227 movement and distinctive period case design adds to the watch’s appeal.
Why You’ll Love It
* Vintage Seiko 5 Automatic
* Correct 4227-00K0 case reference
* Made in Japan
* Deep royal blue two-tone sunburst dial
* Gold-tone dot hour markers
* Gold-tone hands
* Distinctive broad hooded/bullseye-style bezel
* Unusual integrated-style case architecture
* Original Seiko two-tone bracelet
* 3250-B-E bracelet/end-link marking
* 21-jewel Seiko 4227 movement
* Automatic + manual hand-winding
* Approx. 40-hour power reserve
* 21,600 vph frequency
* Practical day-date display
* Recessed 4 o’clock crown
* Compact approximately 35 mm case
* Solid screw-down stainless-steel case back
* MADE IN JAPAN marking
* Strong vintage Japanese watch character
Important Note
This is a vintage mechanical watch. Due to its age and previous use, minor signs of wear may be present on the case, crystal, dial, hands and bracelet. Vintage mechanical watches can require periodic servicing, and timekeeping accuracy and power reserve may vary depending on the watch’s condition and service history.
The Seiko Caliber 4227 supports both automatic winding and manual hand-winding, which is a notable feature of this vintage movement.
The serial number 370200 indicates July of a year ending in 3. The serial number alone does not definitively establish the decade, so the exact production year should not be represented as confirmed solely from the serial.
The watch is sold in the condition shown in the photographs. Please review all photographs carefully for the exact cosmetic condition before purchase.
