Seiko LM (Lord Matic) 5606-7310 – October 1974, Suwa Seikosha

A beautiful and technically and historically significant automatic watch from the late production phase of the legendary Seiko Lord Matic series. This example, serial number 404270, dates from October 1974 and was manufactured in the Suwa factory , known for its precise and robust calibers.

The watch was fully serviced by a master watchmaker in early 2025 and is in excellent working order. The automatic movement runs precisely, the date changes cleanly, and the quick-set function works perfectly. The movement, case, and dial are original and unpolished.

The dial impresses with its characteristic color gradient from gold to brown (so-called “Sunburst Gradient” ), with gold-colored indices and hands, giving the watch a distinctive 1970s look.

Technical data

• Model: Seiko Lord Matic (LM)
• Reference: 5606-7310
• Caliber: Seiko 5606A, automatic, 23 jewels
• Frequency: 21,600 A/h
• Date and day of the week display (bilingual, English/Japanese)
• Origin: Suwa Seikosha, Japan
• Production month: October 1974
• Case: Stainless steel, partly brushed, partly polished
• Diameter: 36.7 mm (excluding crown)
• Height: 12.3 mm
• Lug-to-lug: 41.8 mm
• Lug width: 18 mm
• Weight: approx. 64 g (including leather strap)
• Glass: Hardlex (slightly domed), 9-faceted
• Bracelet: New brown leather strap (reptile texture)
• Water resistance: originally 4 bar (no longer tested)

Condition

The case is in very good condition with clearly defined edges and minimal signs of wear. The crystal is clean, and the dial shows even, attractive aging with a fine "spider patina," typical for Seikos of this period.
The movement was completely overhauled in early 2025 (see watchmaker's mark on the case back), runs reliably and with a stable amplitude value.

Historical context

The Seiko Lord Matic series was introduced in 1968 as the upper class of Seiko automatic models, positioned below King Seiko and Grand Seiko .
The LM models combined precise manufacturing, elegant design and innovative automatic movements such as the Calibre 5606 , which was technically leading with its quick-set date function and automatic day/date switching.

The 5606-7310 was one of the last models before the LM series was discontinued in the mid-1970s – a transitional piece between classic Japanese watchmaking and the beginning of the quartz age.

Special features

• Completely overhauled automatic movement (2025)
• Original Suwa movement 5606A
• Rare two-tone "sunburst" dial
• Bilingual date (Kanji/English)
• Very good condition
• Unpolished original case with clean edges

Warranty (used)
This is a used item. The limitation period for claims based on defects (statutory warranty) is 12 months from delivery.

Notice
As this is a vintage automatic watch, water resistance cannot be guaranteed. To protect the movement, the watch should not come into contact with water or moisture.