Seiko - LM "Gradient Green Sunburst" 理光 (Rikō) – Logical Light - No reserve price - 5606-7310 - Men - 1975

Offered in this auction by Second Vintage A rare opportunity to acquire a Seiko LM "Gradient Green Sunburst" featuring the highly sought-after facet-cut crystal, a true collector’s piece that is increasingly difficult to find in this condition. This vintage Seiko perfectly showcases 1970s Japanese watch design, with a striking sunburst dial, sharp case lines, and a period-correct bracelet—ideal for enthusiasts and collectors pursuing distinctive style and historical significance. Brand: Seiko Model: LM "Gradient Green Sunburst" Reference Number: 5606-7310 Serial Number: 526489 Movement: Automatic (27s to 35s/day on timegrapher) Dial: Gradient green sunburst with gold-tone markers, day-date at 3 o’clock Case Size: 37 mm (excluding the crown) Case Material: Stainless steel Production Year: 1975 Condition: Excellent, original vintage condition with light, honest wear; running within vintage tolerances, with timegrapher results of +27 to +35 seconds per day, indicating healthy movement performance. Dial and Hands The original gradient green sunburst dial is the true highlight of this watch, presenting a beautiful shift from emerald to olive tones depending on the light. Gold-tone applied indices and dauphine hands add warmth and elevate the sophisticated 1970s aesthetic. The lume on hands and indices has gracefully aged to a subtle patina, amplifying the watch’s vintage charm. The crisp day-date display at three o’clock completes this elegant and functional layout. Case and Crystal The 37 mm stainless steel case retains its defined lines and factory brushing, showing only minor signs of gentle wear. The rare facet-cut crystal is a standout feature, its angular edges scattering light and enhancing the dial’s brilliance. The case maintains a robust and attractive profile, with no major dings or scratches visible. Movement Fitted with Seiko’s reliable automatic movement, this Lord Matic model is performing well within vintage tolerances. Timegrapher readings show a daily rate of +27 to +35 seconds, confirming the movement’s healthy operation. The quickset day-date mechanism functions cleanly, delivering both reliability and convenience. Strap The original-style multi-link stainless steel bracelet fits wrists up to approximately 17cm. The bracelet is comfortable, secure, and perfectly complements the watch’s angular case architecture. Condition This Seiko LM remains in excellent vintage condition. The gradient green dial is vibrant and original. Case lines and brushing are well-preserved and crisp. The facet-cut crystal is clear with only minor age-appropriate marks. The bracelet and case show light wear consistent with careful use. The watch is running within vintage tolerances, supported by strong timegrapher performance data. Dimensions Case diameter: 37 mm (excluding the crown) Fits wrist size: up to 17 cm Remarks Facet-cut crystal Seiko LMs with gradient dials have become highly collectible, and examples in such original condition are increasingly rare. This piece stands out for its vibrant dial, strong case geometry, and sought-after crystal—an ideal addition for any vintage Seiko enthusiast or watch collector. History The Seiko LM (Lord Matic) collection exemplifies the brand’s innovation in design and reliable automatic movements from the late 1960s and 1970s. The gradient green sunburst dial and distinctive facet-cut crystal make this a true classic of Seiko’s golden era, offering a unique opportunity to own a piece of Japanese watchmaking history. / Second Vintage SKU: SEIFSVR650000