Serviced Vintage 1973 JAPAN SEIKO LORD MATIC WEEKDATER 5606-7191 25J Automatic.

Serviced Vintage 1973 JAPAN SEIKO LORD MATIC WEEKDATER 5606-7191 25Jewels 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 : 311300.
• Dial number : JAPAN 5606-7330T.
• Glass : Crystal.
• Case size : About 37mm.
• Lug width : 18mm.
• Band : New Leather Strap.

Condition :

• Used, it runs well.
• Quick set(Day/Date) : Okay.
  Day of the week can be set 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.
• Overhaul service in July 2026.
  The movement has been cleaned and oiled, so it works fine.

Key Features

The Spirit of 1973 Modernist Corporate Culture (1973): In **1973**, during a mature historical period when the mechanical watch industry reached its structural peak alongside the rapid rise of early quartz technology, the **Seiko Lord Matic (LM)** series served as a premier timekeeping statement. The reference **5606-7191** was produced by the **Suwa Seikosha** factory to capture the exciting, forward-thinking lifestyle shifts of the early 1970s. Explicitly designed for young corporate leaders and progressive professionals, it successfully provided an energetic, geometric alternative to traditional round profiles.

The Premium Upgraded 25-Jewel Caliber 5606 Heart: This watch is powered by the rare, high-grade **25-jewel Caliber 5606**, an ultra-slim automatic movement operating at **21,600 vibrations per hour (vph)**. While standard mainstream Lord Matic models utilized a 23-jewel layout, this elite **25-jewel specification** was reserved for premium factory runs, deploying extra synthetic rubies to minimize gear-train friction and ensure extreme long-term daily stability. It features executive features like **hacking seconds**, manual-winding capability, and an integrated day-date display.

Architectural ""7191"" Fluid Tonneau-Cushion Geometry: The reference **5606-7191** is highly celebrated among vintage purists for its distinctively stylish **tonneau-cushion case geometry**. Departing from conventional circular designs, the solid stainless steel case showcases sweeping contoured facets, wide integrated lugs, and beautiful mirror-polished edges that perfectly adapt Taro Tanaka's **""Grammar of Design""** guidelines into a softer, aerodynamic profile. This low center-of-gravity architecture minimized wrist fatigue while sliding effortlessly under a tailored suit cuff.

Masterful ""Weekdater"" Dial Legibility and Balance: The dial of the **5606-7191** is a study in clinical mid-century luxury, showcasing a radiant silver sunburst canvas decorated with **hand-applied, multifaceted chunky block indices**. The dual-calendar window at 3 o'clock houses a **bilingual (English/Kanji) day disk**, prioritizing instant everyday legibility for the globalizing Japanese workforce. The applied, interlocking **""LM"" emblem** and the Suwa lightning bolt insignia at 6 o'clock remain proud hallmarks of pure manufacturing pride.

A Landmark Milestone of Suwa's High-Spec Legacy: Produced in the milestone year of **1973**, the 5606-7191 25-jewel variant remains a highly coveted, investment-grade reference for serious collectors who value the **""Mechanical Golden Age.""** It represents the perfect historical intersection where rugged daily durability met early-1970s geometric experimentation and elite, high-jewel micro-engineering right before the full quartz transition. It stands as a profound testament to an era when Suwa Seikosha built mechanical dress watches to an uncompromising industrial standard.

For more information, please look at the pictures.

Notes

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