DUPLAIN – Swiss Made Chronograph Automatic Moon-Phases Calendar Watch

Discover the DUPLAIN – La Chaux-de-Fonds – automatic chronograph watch, featuring a full calendar (day/date/month), 24 hours and moon phases indications. Buy this rare and stylish collector watch at watch-deals.com for 1000 CHF.

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CHF 1'000

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DUPLAIN – La Chaux-de-Fonds – ETA/Valjoux caliber 7751, full calendar with moon phases automatic chronograph watch.

The case diameter is ca. 38 mm (not including the crown and the pushers), in stainless steel, with a see-thru case-back showcasing the oeil-de-perdrix decorated 7751 movement with blue screws.

The dark blue dial has silver baton indexes Arabic numerals, silver hands and white accents.

Small seconds and 24 hours time counter at 9:00, 12 hours counter with moon phases indication at 6:00, 30 minutes counter and day/month indicator at 12:00 (in French). Central seconds hand and central date hand.

Gray textile-over-leather strap (aftermarket) with ardillon buckle.

Description:

Automatic chronograph
Escapement: stone lever
Yoke winding system
Stop mechanism: Cam switching
Glucydur balance wheel
Nivaflex mainspring
Incabloc shock protection

Functions:

Small seconds
1/8-seconds counter, 30-minutes counter, 12-hours counter
Date: hands, quickset date feature
Hacking seconds
Complications: 24-hours indication, day: quickset date feature, moon phase: rapid advance

Data:

25 jewels
28,800 A/h
Power reserve 46h

No box or papers.

The watch is working and keeping a pretty precise time, but as for any other used or vintage watch, a basic revision is recommended.

The article is for sale AS IS – any other parts that are not mentioned in the description, or not visible in the photos, are not included with this item.


Most of the watches that I am selling are liquidation or collector items, therefor I make no claims and give no warranty regarding continual accuracy of time keeping. Used, antique or vintage watches may need servicing, even if they are in good running condition. Unless otherwise stated they may need to be cleaned, oiled, adjusted or timed. I cannot guarantee a used watch to be waterproof or water resistant.

Features

Central Second, Luminous Hands, Self-Winding, Swiss Made, Water-Resistant

Complications

Chronograph, Dual Time, Moonphase, Pointer Date, Triple Calendar

Base Movement

7751 Valjoux

Frequency

28800 A/h

Watch Parts Condition Guide

⌚ Watch Components Condition Guide

Professional grading scale for movements, cases, dials, crowns, crystals, straps, buckles, and steel bracelets

Component Mint (A+) Excellent (A) Good (B) Fair (C) Poor (D)
⚙️ Watch Movements Mint A+NOS / freshly serviced, amplitude ≥270°, ±2s/day, flawless bridges, no marks. Excellent AClean, functional, minor handling marks, amplitude 250-270°, no rust. Good BRunning, may need service, visible wear on plates, keeps time within ±20-30s/day. Fair CRuns erratically, low amplitude, some corrosion or prior non-pro repair. Poor DNon-running, broken parts, heavy rust, only suitable for parts.
📦 Watch Cases Mint A+Unpolished, sharp edges, original finishing, no dings or wear marks. Excellent ALight hairlines, unpolished or light professional polish, case shape crisp. Good BModerate wear, minor dings, polished previously but thickness remains. Fair CVisible dents, over-polished, light pitting, possible aftermarket parts. Poor DHeavy corrosion, deep pitting, stripped threads, bent or missing parts.
🎨 Watch Dials Mint A+Perfect finish, no flaws, luminous intact, printing razor-sharp, NOS. Excellent AVery light patina, all markers present, original, visually appealing. Good BUniform patina, minor edge wear, faint marks, printing fully legible. Fair CVisible scratches, flaking near edges, possible touched-up markers. Poor DSevere damage: missing indices, large paint loss, illegible printing.
👑 Watch Crowns Mint A+Original signed, sharp logo, smooth winding, gasket fresh, water-ready. Excellent ALight microscratches, logo clear, functions perfectly, seals effective. Good BPlating wear on edges, logo slightly faded, threads engage well. Fair CWorn knurling, aftermarket, some corrosion, threads stiff. Poor DSevere corrosion, broken stem interface, non-functional, salvage only.
💎 Watch Crystals Mint A+Flawless, no scratches or chips, OEM crystal, perfect clarity. Excellent AMicro-scratches only visible under loupe, no chips or cracks. Good BSuperficial hairline scratches, can be polished, no structural issues. Fair CVisible scratches, small edge chip, clarity reduced. Poor DCracked, shattered, heavily crazed, missing chunks, must be replaced.
🧵 Watch Straps Mint A+Unworn, original buckle, leather supple, stitching perfect, no stains. Excellent ALightly worn, minimal flex marks, stitching intact, clean. Good BModerate wear, edge wear visible, usable but shows age. Fair CCracking leather, loose stitching, stretched holes, cosmetic flaws. Poor DBroken, torn, extreme stiffness, non-functional, replacement needed.
🔗 Buckles (Tang/Deployant) Mint A+NOS finish, logo crisp, perfect closure, joints like new. Excellent AMinor surface wear, logo fully visible, mechanism smooth. Good BVisible scratches, light plating wear, clasp secures properly. Fair CHeavy wear, logo faded, minor rust, function slightly affected. Poor DBroken hinge, severe corrosion, cannot hold strap, unserviceable.
⛓️ Steel Bracelets Mint A+Unworn, full links, protective stickers, perfect articulation, no stretch. Excellent AMinor hairlines on clasp, very light stretch, original finish preserved. Good BModerate stretch, light scratches, clasp locks securely. Fair CNoticeable stretch, deep scratches, weak clasp closure. Poor DExcessive stretch, broken links, clasp broken, unsafe for wear.
⚡ Grading based on industry standards • Mint = as new / NOS • Excellent = light wear • Good = honest wear • Fair = functional with flaws • Poor = needs restoration
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DUPLAIN - Swiss Made Chronograph Automatic Moon-Phases Calendar Watch

DUPLAIN - Swiss Made Chronograph Automatic Moon-Phases Calendar Watch

CHF 1'000

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    DUPLAIN - Swiss Made Chronograph Automatic Moon-Phases Calendar Watch

    DUPLAIN - Swiss Made Chronograph Automatic Moon-Phases Calendar Watch

    CHF 1'000

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