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Also uses Seiko Cal. 6R35
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Authentication
The hand-finished lug facets are the sole authentication; any rounding at 10x magnification means the watch has been polished.
- Polishing at service removes the hand-applied sharp facets; this is irreversible and significantly reduces collector value.
- Under-lug areas are the first surfaces to show polishing rounding; examine with a loupe before any surface inspection.
| Area | What to check | What is correct | Red flag |
|---|---|---|---|
| case | Lug facet sharpness at 10x magnification | Right-angle intersections between polished and brushed surfaces are visibly sharp with no rounding | Any rounding or blurring at lug facet transitions; polishing damage is present |
| case | Under-lug surface transitions | Factory brushed surfaces meet polished facets at a clean visible line | Blurred transition line under the lug; first sign of polishing damage |
- Case polishing is the most damaging service action for the Sharp Edged line; confirm no polishing before purchase.
Authentication guide
The SPB169 is the flagship Sharp Edged reference with a blue arita-porcelain-inspired dial and a hand-finished faceted case. The case planes are the primary authentication point: each facet should have a distinct mirror polish from hand-finishing. Reproductions are uncommon, but the case finishing quality is the clearest tell between an original and an imitation.







