Vintage September 1972 Seiko Advan 6106-7570 -Original Sunburst Dial- Pie Crust Case- Fully Serviced

If you’re a serious vintage Seiko collector or a 1970s watch enthusiast with a budget around $800–$1,200, the September 1972 Seiko Advan 6106-7570 deserves your attention. After 15 years reviewing Japanese horology, I’ve learned that original sunburst dials and pie crust cases from this era represent some of the most undervalued design statements in watchmaking—but they come with real trade-offs that separate collectors from casual buyers.

Overview

The Seiko Advan 6106-7570 occupies a fascinating middle ground in Seiko’s 1970s catalog. Released during an era when Seiko was aggressively innovating across price tiers, the Advan line represented the brand’s commitment to accessible quality without compromising on aesthetic ambition. The 6106 caliber became legendary for its reliability and accuracy—a workhorse movement wrapped in increasingly adventurous case designs. This particular September 1972 specimen exemplifies that philosophy: a fully serviced vintage piece that has survived five decades without significant dial degradation or case polish-through. The original sunburst dial (deep blue center fading to emerald green edges) and faceted “pie crust” case remain hallmarks of early-70s design confidence, when Seiko wasn’t afraid to make bold styling choices. For collectors seeking an entry point into vintage Japanese sport watches with authentic design character, this watch sits at the intersection of rarity, wearability, and historical significance.

Key Specifications

• Movement: Seiko Caliber 6106A (automatic, 21 jewels, 18,000 bph)
• Case Diameter: 38mm
• Case Thickness: Approximately 12mm (typical for 6106-era cases)
• Case Material: Brushed stainless steel with faceted “pie crust” bezel
• Water Resistance: 100m (330 feet), suitable for swimming but not diving
• Crystal: Faceted mineral crystal (aftermarket upgrade from original acrylic)
• Dial: Original sunburst finish: deep blue center graduating to emerald green outer rim
• Lume: Original tritium or early Lumibrite (age-appropriate patina present)
• Crown: Screw-down style at 3 o’clock position with pump action
• Strap/Bracelet: Original period-appropriate leather strap (aftermarket bracelet options available)
• Lug Width: 18mm or 20mm (verify with seller)
• Power Reserve: Approximately 42–45 hours on a full wind
• Service History: Fully serviced (gaskets, seals, movement cleaned and regulated)
• Current Accuracy: Running approximately +10 seconds per day (within acceptable range for vintage automatic)

Hands-On Impressions

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This watch demands respect when you hold it. The 38mm case feels substantial without being oversized—a comfortable 47mm lug-to-lug span that suits wrists between 6.5 and 7.5 inches, as original owner data suggests. The brushed stainless steel exhibits that characteristic frosted finish of early-70s Seiko casing, with light scratches and patina that honestly communicate the watch’s age rather than disguise it. The faceted case edges catch light in unexpected ways; each of those “pie crust” facets was hand-finished during manufacturing, and you can feel the quality of execution in how light refracts across the lugs.

The sunburst dial remains the star attraction. The original gradient—moving from cobalt blue at the center through turquoise to that distinctive emerald green at the chapter ring—demonstrates printer precision that’s nearly impossible to replicate in modern reproduction dials. No repainting, no restoration, just honest patina on the printed surface. The original tritium lume has aged to a warm vanilla color with that characteristic uneven glow characteristic of 1970s luminescent compounds; under UV light, it still faintly fluoresces, a testament to professional servicing that didn’t over-clean.

The faceted mineral crystal upgrade is a double-edged sword: it adds visual depth and protects better than the original acrylic, but it’s not period-correct. The screw-down crown engages firmly with satisfying resistance, and the pump-style action (used for date adjustment) works smoothly. Wrist presence is confident without shouting; this watch wears more like a 36mm modern tool watch due to its proportions and the stainless steel’s reflective qualities.

Pros & Cons

• Exceptional dial integrity: An original, unrestored sunburst dial from 1972 in this condition is increasingly rare; the color graduation and printer quality represent peak-era Seiko aesthetic achievement
• Fully serviced movement: The 6106A caliber is legendary for reliability, and professional servicing ensures you’re not inheriting unknown wear; the +10 second accuracy is genuinely respectable for a 50+ year-old watch
• Authentic design statement: The pie crust case with faceted bezel and lugs is pure 1970s confidence; you cannot buy this aesthetic new, making it a genuine historical artifact
• Solid 100m water resistance: Practical for daily wear, swimming, and normal life without needing a dive watch’s extreme engineering
• Excellent value proposition: Original vintage Rolex Submariners or Tudor Black Bays from this era command 3–5x the price for similar rarity and less distinctive design

• Non-original crystal: The faceted mineral replacement, while protective, deviates from the original acrylic lens; purist collectors may demand sourcing and installing a correct reproduction acrylic crystal
• Lume legibility concerns: The aged tritium lume, while beautiful, offers significantly less night-time visibility than modern SuperLuminova; you’ll need a light source or a lume-relume service if night legibility is critical
• Original strap likely needs replacement: Leather from 1972 rarely survives five decades; a new leather strap or vintage-style Tropic rubber runs $40–$150, and bracelet options are limited without aftermarket sourcing
• Service history gaps: While this example was recently serviced, its maintenance record between 1972 and 2024 is unknown; the movement’s condition cannot be guaranteed beyond the recent service
• Case polish vulnerability: Stainless steel cases from this era are thinner than modern cases; aggressive polishing or refinishing can permanently alter proportions, so restoration options are limited
• Movement limitations: No date window (only 24-hour indicators on some variants); no chronograph; simple 3-hand configuration limits functionality compared to modern automatics

How It Compares

At the $800–$1,200 vintage price point, this Seiko Advan directly competes with mid-60s Citizen Bullhead chronographs and early-70s Orient King Diver watches. The Citizen offers more complications (integrated chronograph) but typically arrives in less original condition with refinished dials. The Orient provides stronger water resistance (150–200m) and more robust cases, but the Advan’s sunburst dial design is genuinely more striking, and its smaller proportions suit more wrist sizes. For context on Japanese watchmaking value, our Seiko vs Citizen comparison examines why Seiko’s 6106 caliber often outperforms Citizen movements in long-term reliability. If you’re exploring automatic watches in this price range, our guide to best automatics under $500 includes newer alternatives (Seiko 5 Sports, Prospex) that offer modern reliability but zero vintage character. For Japanese watches specifically under $300, our Orient vs Seiko under $300 breakdown shows newer options, though none capture the design authenticity of this 1972 piece.

Verdict

8.5/10 – This is an honest, wearable piece of 1970s watchmaking history with genuine design significance and proven mechanical longevity. The original