Vintage 1964 Seiko Sportsmatic 5 – 21 Jewels Automatic Day-Date with Kanji Day Wheel – JDM Classic Original Seiko Sportsmatic 5 automatic wristwatch, produced in Japan in the 1960s. Based on the caseback serial number (4712324), this piece dates to circa 1964, making it an early example of the legendary Seiko 5 lineage. A genuine Japanese Domestic Market (JDM) watch featuring the rare kanji day wheel. Dial: Beautiful silver sunburst dial with applied gold-tone hour indices and matching dauphine-style hands. The dial is signed "Seiko Sportsmatic 5" with the early Seiko 5 shield logo, and marked "WATER PROOF / DIASHOCK 21 JEWELS" – hallmarks of 1960s Seiko production. The day-date window at 3 o'clock displays the day of the week in Japanese kanji characters, a highly sought-after feature among international collectors. Case and Caseback: Gold-tone case with sharp, elegant lugs that reflect the refined design language of mid-1960s Seiko. The stainless steel caseback is engraved with the serial number 4712324, indicating production in July 1964. Bracelet: Fitted with a two-tone expansion-style metal bracelet. The bracelet appears to be a period replacement rather than the original, which is common for watches of this age. Movement: Automatic (self-winding) 21-jewel movement with Diashock protection. The watch is currently running. Unique Piece: The Sportsmatic 5 is where the Seiko 5 story began – one of the most iconic and enduring watch lines in horological history. This example, with its kanji day wheel and original 1960s charm, is a true JDM treasure. A piece of Japanese watchmaking heritage, over 60 years old and still ticking. Condition: Good vintage condition considering its age of approximately 60 years. The case and crystal show light signs of wear consistent with normal use, and the gold-tone finish shows some aging. These traces of time only add to its authentic vintage character. Please refer to the photos for details. Maintenance: Recently cleaned. As with any vintage timepiece, a professional service is recommended for long-term daily use. Shipping and Customs: Since the item will be shipped from Japan, customs duties may apply upon arrival. According to Catawiki's policy, any import duties or taxes are the responsibility of the buyer. Specifications: Brand: Seiko Model: Sportsmatic 5 Movement: Automatic, 21 jewels, Diashock Serial Number: 4712324 (circa July 1964) Dial: Silver sunburst, day-date (kanji day wheel) Case: Gold-tone Bracelet: Two-tone expansion bracelet (likely period replacement) Origin: Made in Japan (JDM) Keywords: Seiko, Sportsmatic, Seiko 5, vintage watch, automatic watch, 1960s, JDM, Japan, kanji day date, 21 jewels, Diashock, gold watch, sunburst dial, collector, mechanical watch, antique watch, Tokyo vintage, mid century