Seiko - Seikomatic - No reserve price - 15031D - Men - 1963

Now available at auction from Second Vintage

A classic and elegant early 1960s Seikomatic, this reference 15031D is distinguished by its beautifully preserved silver sunburst dial. The presence of the SD (Special Dial) star logo above six o'clock indicates the use of solid gold indices, adding a subtle touch of luxury to the exceptionally clean mid-century aesthetic. Powered by the reliable caliber 603 and featuring the signature recessed crown at four o'clock, this piece offers highly attractive vintage character and strong mechanical performance.

Brand: Seiko
Model: Seikomatic
Reference Number: 15031D
Serial Number: 3100493
Movement: Automatic, Caliber 603, 20 Jewels, 18,000 bph
Dial: Silver sunburst with applied faceted indices and SD star logo
Case Size: 37 mm (excluding the crown)
Case Material: Gold-plated, gold-filled caseback
Production Year: 1963
Condition: Good vintage condition. Timegrapher: +19+22s/day, running strong and steady.

Dial and Hands
The silver sunburst dial is exceptionally clean and attractive, remaining very well preserved. The applied faceted indices are bright and crisp, complementing the fully intact printed text. A notable feature for collectors is the clearly visible SD (Special Dial) star logo located above the six o'clock position. The gold-tone dauphine hands exhibit an age-appropriate patina, showing some light oxidation and micro-spotting under macro inspection, though their shape and finish remain well defined.

Case and Crystal
The 37 mm case features a brass mid-case electro-gold-plated to 20 microns, paired with a gold-filled stainless steel caseback. The watch displays honest vintage wear, with moderate surface scratches, handling wear, and some softening to the lug chamfers. The plating appears generally intact, showing minor wear on the sharp edges. A thin gold-tone bezel frames the dial, displaying light surface scratches consistent with the rest of the case. The distinctive recessed crown is positioned at four o'clock. The domed acrylic crystal is clear, with no major scratches, cracks, or crazing visible.

Movement
Inside is the automatic Seiko Caliber 603, operating at a frequency of 18,000 beats per hour. The movement appears very clean, showing no obvious signs of corrosion or moisture damage, with good screw heads and only light surface scratches on the rotor. The engravings reading "SEIKOSHA", "SEIKOMATIC 20 JEWELS", and "603" are clearly present. +19+22s/day. Performing well within expected vintage tolerances; running strong and steady.

Strap
The watch is fitted with a modern brown leather strap featuring contrast stitching. It appears to be in near-new condition with minimal wear.

Condition
Good vintage condition. The case shows honest, age-appropriate wear with moderate surface scratches and some softening to the lugs, while the dial remains in exceptionally well-preserved condition. The hands display light oxidation and micro-spotting visible under close inspection. The clean movement is performing strongly and reliably.

Dimensions
The case measures 37 mm (excluding the crown).

Remarks
This Seikomatic is a highly appealing example of early 1960s Japanese watchmaking. The presence of the SD dial with its solid gold indices enhances the elegant aesthetic, while the clean caliber 603 movement ensures it remains a dependable companion. It is a well-regarded model appreciated for its refined design and distinctive recessed crown.

History
The Seikomatic line was a significant part of Seiko's catalog in the early 1960s, introducing accessible automatic winding to a broader audience. The 20-jewel Caliber 603 found in the reference 15031D is essentially a 17-jewel base movement with three additional jewels dedicated to the automatic winding module. Because the Caliber 603 is an automatic-only movement with no manual hand-winding capability, Seiko designed the watch with a recessed crown at the four o'clock position, encouraging the wearer to rely entirely on the motion of their wrist to power the timepiece.

Payment and Shipping
Payment must be completed within 1–3 days after purchase.
Your watch will be professionally and securely packaged, then shipped with tracking and insurance for your peace of mind.
We use fast express shipping, with typical delivery within 1–4 business days, depending on the destination.
Please note that vintage watches may show minor signs of wear, aging, or imperfections, which are considered normal for watches of this age.
We kindly ask you to review all photos carefully before bidding. We photograph each watch from multiple angles to provide the most accurate representation possible, and the photos form an important part of the description.
The timegrapher assessment if provided is seen as an indication of the movement’s condition under fully wound testing conditions. As with all vintage watches, results may vary in daily use.
If you have any concerns regarding functionality or defects after delivery, please contact us within 3 days of receiving the watch so we can assist you.
As with all used watches, water resistance is not guaranteed.
If you have any questions, feel free to contact us after the auction ends.

/ Second Vintage

SKU: SEI-MJD-0001