“DANIEL ROTH – Premier Retrograde 807.L.10 (Black) Watch Dial” has been added to your cart. View cart

OMEGA Speedmaster Date Original Watch Movement Calibre 1155 - Vj 7750

OMEGA Speedmaster Date Original Watch Movement Calibre 1155 – Vj 7750

Name: OMEGA Speedmaster Date Original Watch Movement Calibre 1155 - Vj 7750
Brand: Omega
SKU: OMG1155WM
Price: 350 CHF
Availability: InStock

Brand: Omega

This is an OMEGA Speedmaster Date movement, the calibre 1155. Based on the robust Valjoux 7750, it is a historically significant automatic chronograph from a transitional period. The movement is sold as a functional, standalone unit, ready for installation after a recommended service.

Estimated Delivery: Thu, Jun 11 – Fri, Jun 19 (Excl Sat, Sun)

... people are viewing this right now

Guaranteed Safe Checkout

CHF 350

Only 1 item(s) left in stock.

Description

Omega Speedmaster Date Calibre 1155 Automatic Chronograph Movement (Valjoux 7750 Base)

Overview

The **Omega** calibre 1155 is an automatic chronograph movement based on the **Valjoux** 7750, produced between the 861/1861 and the later ETA/Dubois-Depraz calibers. Introduced in 1991, it was used in the **Speedmaster Date** line, offering a day/date function (though **Omega** omitted the day display). This movement represents a transitional period in **Omega**’s chronograph history, bridging the manual-wind 861 and the modern co-axial era.

The calibre 1155 retains the **Valjoux** 7750’s core architecture, including its cam-actuated chronograph, unidirectional automatic winding, and modular calendar system. It features 17 jewels, a lever escapement, and an Incabloc shock absorber. The finishing includes *œil-de-perdrix* circular graining on the plates and *Côtes de Genève* stripes on the oscillating weight, which is engraved with the **Omega** logo and reference.

This movement is sold as a standalone unit, without additional parts or accessories. It is functional and maintains timekeeping within expected vintage tolerances, though a full service is recommended before installation. The condition is consistent with a used movement of this era, with visible signs of handling and storage.

Specifications

The **Omega** calibre 1155 is a modified **Valjoux** 7750 with the following technical details:

Base movement: **Valjoux** 7750 automatic chronograph
Jewels: 17
Escapement: Lever, Incabloc shock protection
Balance: Monometallic, Etachron regulator with balance spring stud
Frequency: 28,800 BPH (4 Hz)
Power reserve: ~42 hours (standard for 7750 family)
Winding: Unidirectional automatic, center-mounted rotor with *Côtes de Genève* decoration
Chronograph: Cam-controlled, with 30-minute counter at 12:00 and 12-hour counter at 6:00
Small seconds: Subdial at 9:00
Date: Quickset, aperture at 3:00 (white disc with black numerals)
Day function: Present but unused in **Omega** applications (mechanism retained from 7750 base)

Plate structure: Three brass plates (calendar plate with modular components, main plate with off-center center wheel and hacking lever, top plate with winding bridge). The ratchet uses a simple bent-spring design.

Markings on the movement include:
Ω | OMEGA | 1155 (rotor engraving)
17 JEWELS | SEVENTEEN | SWISS (main plate)
7750 (base caliber designation)
ETA logo (indicating **Valjoux** 7750 lineage post-ETA acquisition)

Finishing: *Œil-de-perdrix* circular graining on plates, blued screws, and perlage on visible surfaces. The oscillating weight is decorated with *Côtes de Genève* stripes.

Notes

The article is sold “AS IS”. A basic revision (cleaning, oiling, and timing) is recommended before use to meet manufacturer specifications.
Any parts not explicitly mentioned in this description or not visible in the accompanying photographs are not included.
Colors may appear slightly different across various screens and devices, so we cannot guarantee an exact screen-to-reality color match.

This calibre 1155 is a historically significant **Omega** movement, combining **Valjoux**’s robust 7750 architecture with **Omega**’s Speedmaster lineage, suitable for restoration projects or as a replacement for compatible Speedmaster Date models.

Frequently Asked Questions

Is this movement compatible with all Speedmaster Date models?

This calibre 1155 is designed for **Omega Speedmaster Date** references from the early 1990s that utilized the **Valjoux** 7750 base. Compatibility depends on the specific case and dial configuration—verify against **Omega** technical documentation for your reference.

Does the movement include the day function?

The 7750 base includes a day/date mechanism, but **Omega** disabled the day display in the calibre 1155. The date function remains operational, with a quickset feature accessible via the crown.

What service is recommended before installation?

A full revision is advised: disassembly, ultrasonic cleaning, relubrication with **Omega**-specified oils, and timing adjustment to ±10 seconds/day. The Incabloc shock absorbers and chronograph cam system should be inspected for wear.

Are the subdials positioned differently from the manual-wind Speedmaster (calibre 861/1861)?

Yes. The calibre 1155 follows the **Valjoux** 7750 layout: small seconds at 9:00, 30-minute counter at 12:00, and 12-hour counter at 6:00. This differs from the 861/1861, where the 12-hour counter is at 9:00 and running seconds at 3:00.

What is the expected accuracy after servicing?

Post-service, the calibre 1155 typically achieves ±10 to ±20 seconds/day in horizontal positions, assuming the balance and hairspring are in original specification. Magnetic resistance and positional variations may affect real-world performance.

Additional information

Base Movement	7750 Valjoux
Frequency	28800 A/h
Jewels	17
Power Reserve	ca. 44 hours
Complications	Chronograph, Date Window
Features	Central Second, Self-Winding, Swiss Made
Overall Condition	As Good As New

Condition Grading Scale

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 or factory new, flawless bridges, no marks.	Excellent AClean, functional, minor handling marks, no rust.	Good BRunning, may need service, visible wear on plates, keeps correct time.	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

SKU: OMG1155WM Categories: Basic Movements, Watch Movements, Watch Parts Tags: 17 Jewels, 7750 Valjoux, Automatic Movement, Calibre 1155, ETA 7750, Omega, OMEGA Watch Movements, Self-Winding, SpeedMaster, Watch Movements Brand: OmegaGroups: Movements, Omega, Speedmaster

Browse Categories

OMEGA Speedmaster Date Original Watch Movement Calibre 1155 – Vj 7750

Shipping

Return

Help