Vintage 1962’s JAPAN SEIKO SPORTSMATIC CALENDAR J13057 19Jewels Automatic.

Vintage 1962’s JAPAN SEIKO SPORTSMATIC CALENDAR J13057 19Jewels Automatic.

Welcome to my auction!
I am Japanese who live in Tokyo.

Item description

Movement :

• Pet name : SPORTSMATIC CALENDAR .
• Caliber number : 790.
• Movement : Automatic.
• Beat rate : 18000bph.
• Year of manufacture start : 1962's.
• Factory : Suwa.

Externals :

• Serial number : D205303.
• Dial number : JAPAN MADE SMAC J13H285ED.
• Glass : Acrylic.
• Case size : About 36.7mm.
• Lug width : 18mm.
• Band : New Leather Strap of SEIKO original.

Condition :

• Used, it runs well.
• Quick set(Day/Date) : Okay.
  Set the date: Iteration the hour hand at 9:00 and 12:00
• The day difference time of an used watch is about +-1 minute / day.
• For practical, everyday use, it would be advisable to have the movement cleaned and oiled.

Key Features

The Holy-Grail Founding Era of Sportsmatic Calendar Horology (1962): Manufactured in **1962**—during the foundational dawn of Suwa Seikosha's automatic calendar development—the **Seiko Sportsmatic Calendar** reference **J13057** represents one of the earliest dedicated date-automatic sports-dress watches produced by Seiko. Identified by its historic pre-1965 five-digit reference code, this model established the versatile, water-resistant daily automatic template that would capture the global market throughout the 1960s.

The Historic 19-Jewel Caliber 820 Automatic Engine: Powering this rare timepiece is the early **19-jewel Caliber 820** (later integrated into the 7625 movement family), operating at a classic frequency of **18,000 vibrations per hour (vph)**. Engineered for dependable daily service, this movement incorporates Suwa's proprietary **Diashock** anti-shock architecture, the high-efficiency Magic Lever self-winding mechanism, and a semi-quickset date changing function operated by cycling the hands across midnight.

Architectural ""J13057"" Case and Integrated Recessed Crown: Sourced in a heavy-gauge solid stainless steel case, the reference **J13057** exhibits early pre-Grammar of Design aesthetic hallmarks, featuring bold, sharp-tapering lugs and broad polished side bevels. Designed with a slim bezel profile and Suwa's signature **recessed crown hidden flush at 4 o'clock**, the case achieves a completely seamless, symmetrical silhouette that rests flat and commanding on the wrist.

Historic Cross-Pattern Sunburst Dial and Early Script Detailing: The dial of the **J13057** displays early-1960s executive artistry, frequently featuring a fine cross-hatched or radiant silver sunburst texture set with **hand-applied, multifaceted rectangular hour indices** and sharp razor-edged dauphine hands. Free from day-window clutter, the neatly framed date aperture at 3 o'clock is symmetrically balanced by the script **""Seiko Sportsmatic""** logo, **""Calendar""** designation, and **""WATER PROOF / DIASHOCK 19 JEWELS""** text above 6 o'clock.

The Sovereign Solid Gold Dolphin Case Back Medallion: The ultimate seal of historical authenticity rests on the case back: the iconic **solid gold-embossed Seiko Dolphin medallion** (or deeply etched early crown/dolphin emblem) set into the case center. Certifying its factory-regulated precision and early water-resistant construction, the 1962 J13057 19-jewel Sportsmatic Calendar stands as a highly coveted, investment-grade cornerstone reference for serious vintage Seiko purists.

For more information, please look at the pictures.

Notes

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