Vintage 1972 JAPAN SEIKO LORD MATIC WEEKDATER 5606-5040 23Jewels Automatic.

Vintage 1972 JAPAN SEIKO LORD MATIC WEEKDATER 5606-5040 23Jewels Automatic.

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

Item description

Movement :

• Pet name : 56 LORD MATIC WEEKDATER .
• Caliber number : 5606A.
• Movement : Automatic.
• Beat rate : 21600bph.
• Year of manufacture start : 1968's.
• Factory : Suwa.

Externals :

• Serial number : 240439.
• Dial number : JAPAN 5606-5140T.
• Glass : Acrylic.
• Case size : About 33mm.
• Lug width : 19mm.
• Band : New Leather Strap of SEIKO original.

Condition :

• Used, it runs well.
• Quick set(Day/Date) : Okay.
  Set the day of the week can be in English or Kanji.
  Set of the date : The set at one stage pulling the crown.
• 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 Icon of 1970s TV-Case Design (1972): Manufactured in **1972**—a milestone year defining Seiko's mid-century aesthetic evolution—the **Seiko Lord Matic Weekdater** reference **5606-5040** stands out as an iconic squarish ""TV-screen"" executive dress watch. Created by Suwa Seikosha, this model seamlessly blended high-grade mechanical performance with the bold, avant-garde geometric styling that swept Japanese horology in the early 1970s.

The Ultra-Slim 23-Jewel Caliber 5606 Automatic Heart: Powering this historic timepiece is the proven **23-jewel Caliber 5606**, operating at a smooth frequency of **21,600 vibrations per hour (vph)**. Celebrated for its slim architectural profile, this in-house caliber allowed designers to create sleek, low-profile rectangular cases without sacrificing functionality, providing **hacking seconds**, quick-set dual calendar control, and manual-winding capability.

Architectural ""5040"" TV-Screen Case Geometry and Facets: Sourced in a solid stainless steel case, the reference **5606-5040** is globally recognized for its signature rectangular cushion geometry. Adhering to Taro Tanaka's **""Grammar of Design""** philosophy on angled surfaces, the case features broad, brushed front planes contrasted by razor-sharp, zero-distortion Zaratsu-polished side bevels engineered to sit flush against the wrist.

Masterful Dual-Calendar Dial Harmony and Geometric Framing: The dial of the **5606-5040** showcases outstanding visual symmetry adapted to a squarish layout. A radiant silver sunburst canvas is decorated with **hand-applied, multifaceted rectangular indices** and razor-edged hands. Framed neatly at 3 o'clock, the dual-calendar window houses a **bilingual (English/Kanji) day disk** alongside the date wheel, offset by the applied **""LM"" emblem** above 6 o'clock.

An Investment-Grade Milestone of Showa-Era Form Factor: Produced during the prime production run of the 56LM series in **1972**, the 5606-5040 23-jewel Lord Matic Weekdater remains a highly sought-after, distinctive cornerstone reference for vintage Seiko purists. It serves as an eternal testament to Suwa Seikosha's mastery of non-circular case design during the peak of Japan's mechanical watchmaking era.

For more information, please look at the pictures.

Notes

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