Vintage 1962 JAPAN SEIKO CRONOS J13046 21Jewels Hand-winding.

Vintage 1962 JAPAN SEIKO CRONOS J13046 21Jewels Hand-winding.

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

Item description

Movement :

• Pet name : CRONOS.
• Caliber number : 54A.
• Movement : Hand-winding.
• Beat rate : 18000bph.
• Year of manufacture start : 1958's.
• Factory : Kameido.

Externals :

• Serial number : 251J272.
• Dial number : JAPAN CJ13H265E.
• Glass : Acrylic.
• Case size : About 35.2mm.
• Lug width : 18mm.
• Band : New Leather Strap.

Condition :

• Used, it runs well.
• 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 Sovereign Peak of Daini's Hand-Wound Precision (1962): Manufactured in **1962**—during the zenith of Daini Seikosha's manual-wind development—the **Seiko Cronos** reference **J13046** represents one of the most historically significant models produced by Daini. Originally launched in 1958 to challenge Suwa's Marvel line, the Cronos platform laid the direct mechanical foundation for the birth of King Seiko and Daini's legendary high-beat watchmaking.

The High-Grade 21-Jewel Daini Cronos Engine: Powering this historic dress watch is the over-engineered **21-jewel Caliber 54** movement (Cronos base architecture), operating at a classic frequency of **18,000 vibrations per hour (vph)**. Outfitted with an elevated **21-jewel specification**, this hand-wound caliber utilized an ultra-slim mainplate design, Seiko's proprietary **Diashock** anti-shock protection, and a highly refined train wheel setup engineered for superior accuracy.

Architectural ""J13046"" Water 50 Proof Case Geometry: Sourced in a solid stainless steel case, the reference **J13046** is globally distinguished by its rare **""Water 50 Proof""** heavy-duty case construction—an early precursor to modern water resistance ratings. Featuring long, sweeping lugs with razor-sharp polished bevels and a beefy screw-down or reinforced snap-back, the case offers a commanding, low-profile presence on the wrist.

Immaculate Time-Only Dial Harmony and Script Typography: The dial of the **J13046** displays early-1960s visual restraint, set against a radiant silver sunburst canvas set with **hand-applied, multifaceted rectangular hour indices** and sharp dauphine hands. Free from calendar aperture clutter, the dial features the stylized flowing script **""Seiko Cronos""** logo paired with the bold, sought-after **""WATER 50 PROOF""** and **""Diashock 21 Jewels""** typography above 6 o'clock.

An Essential Pre-1964 Cornerstone of Daini's King Seiko Lineage: Produced during the foundational golden era of Japanese manual-wind watchmaking in **1962**, the J13046 21-jewel Seiko Cronos Water 50 Proof stands as a highly coveted, investment-grade cornerstone reference. It captures the vital historical lineage that directly enabled Daini Seikosha to develop the inaugural 44KS King Seiko series shortly thereafter.

For more information, please look at the pictures.

Notes

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