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Movement tier: unclassified
Medium-large: suits wrists 6.5 in+ (16.5 cm+)
40 mm case. Wears confidently on average to larger wrists. May overhang on slender builds.
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Authentication
Grey-market misrepresentation is the primary risk; the moon phase display and three-register layout are the key identification points.
Known issues in the market
- Grey-market examples without original box and papers.
- Moon phase display that has been serviced with incorrect moon disc (wrong star pattern or moon rendering).
- Leather strap with worn or absent Longines signature stitching; strap condition affects overall presentation.
- Three-register layout confused with two-register chronographs from the same collection.
| Area | What to check | What is correct | Red flag |
|---|---|---|---|
| dial | Three-register layout with moon phase | Subsidiary seconds at 9; 30-minute counter at 3; moon phase display at 6 (moon phase overlaps with 12-hour counter or has its own window); layout is balanced and symmetrical | Only two subdials; moon phase window absent; subdials at wrong positions (e.g., 6 and 12 instead of 3, 6, and 9) |
| dial | Moon phase display quality | Moon disc shows a detailed moon rendering against a star field; moon phase advances accurately (disc turns approximately one tooth per day); "LONGINES" and "MASTER COLLECTION" text crisp | Moon rendering that is a simple circle with no surface detail; moon disc that does not advance with crown adjustment; text with blurring under loupe |
| movement | Cal. L687 column-wheel chronograph | Cal. L687 (ETA A08.L11 base) has a column wheel; chronograph start/stop is via pusher at 2; reset at 4; movement visible through exhibition caseback shows column wheel and horizontal clutch | Cam-actuated chronograph (no column wheel); pushers at wrong positions; chronograph hand that ticks rather than sweeps |
| bracelet | Leather strap Longines signature | Longines logo stitched or embossed on the strap; Longines tang buckle with logo engraved; stitching is even and tight | Generic strap without Longines markings; buckle without Longines logo; stitching that is uneven or already unraveling |
| caseback | Exhibition caseback showing Cal. L687 | Cal. L687 visible through caseback; ETA A08 base architecture with Longines finishing; Longines rotor; column wheel visible | Movement architecture inconsistent with ETA A08 base; rotor without Longines branding; absence of column wheel |
Common legitimate replacements
- Leather straps are the most commonly replaced component on Master Collection pieces; original Longines straps are preferred.
- Moon phase discs can be replaced during service; verify the disc rendering matches original Longines specifications.
- Chronograph movements require service every 7 to 10 years; service records from Longines or authorized watchmaker support authenticity.
Expert resources: Longines serial dating at longines.com. WatchUSeek Longines forum covers Master Collection Chronograph references. Cal. L687 column-wheel identification through the exhibition caseback is the definitive movement check.
Authentication guide
Last reviewed June 2026
The L687 is an ETA A08.L11-based column-wheel chronograph with full calendar and moonphase. The complication density on the dial is the reference point for authentication.
Sources: Monochrome — Master Collection overview.






