ABF Factory Franck Muller Cintrée Curvex 8880 T D CD 39.5mm Diamond Leather Strap White Diamond Dial

ABF Factory Franck Muller Skeleton Tourbillon 25-Jewel Watch

The ABF Factory Franck Muller Skeleton Tourbillon is a manually wound mechanical watch built around an openworked 25-jewel tourbillon movement.

Its movement architecture incorporates twin mainspring barrels with a supplied power-reserve specification of approximately 72 hours when fully wound.

The openworked construction exposes much of the mechanical architecture from the dial side, while a transparent caseback provides an additional view of the movement.

The exterior combines a curved 316L stainless steel case, domed sapphire crystal and Italian calfskin leather strap.

Openworked Tourbillon Movement

The defining technical feature of this ABF configuration is its openworked mechanical tourbillon movement.

Rather than concealing the movement beneath a conventional solid dial, the skeletonized architecture exposes bridges, wheels, barrels and other mechanical components.

This allows the operation of the movement to remain visible while the watch is running.

The exact caliber designation was not supplied, so no unsupported movement number is added.

25-Jewel Architecture

The supplied movement specification lists 25 jewels.

Movement jewels are used at selected friction and pivot points within a mechanical caliber.

The jewel count should be treated as one movement specification rather than an indicator of overall movement quality by itself.

For database purposes, the movement can therefore be documented as a:

25-jewel openworked manual-winding tourbillon movement.

Tourbillon Mechanism

The tourbillon assembly is a major visible mechanical component within the openworked architecture.

Its rotating cage carries part of the regulating system, making its operation visible while the movement is running.

For QC inspection, the tourbillon should be observed through multiple rotations to check for stable operation without visible interruption or abnormal behavior.

Actual rate performance should still be measured separately using appropriate testing equipment.

Twin Mainspring Barrels

The movement incorporates a twin-barrel architecture.

Two mainspring barrels provide the stored mechanical energy required to operate the movement.

This is particularly relevant because the openworked construction allows parts of the winding and energy-storage architecture to remain visible.

The twin-barrel arrangement is also associated with the supplied extended power-reserve specification.

72-Hour Power Reserve

The supplied specification lists a power reserve of approximately 72 hours when fully wound.

This represents roughly three days of theoretical running time from a complete wind.

For technical accuracy, 72 hours should be treated as the model’s supplied specification rather than a guaranteed result for every individual movement.

Future QC testing can record the actual running duration of an individual watch from full wind until stopping.

Manual-Winding Architecture

This configuration is manually wound.

Unlike an automatic watch, there is no conventional rotor responsible for replenishing the mainspring through wrist movement.

The crown is therefore used to wind the twin mainspring barrels.

When winding, the crown should be turned gently. Once clear resistance indicates that the movement is approaching a full wind, additional force should not be applied.

Visible Winding Mechanism

One interesting aspect of the openworked movement is that parts of the winding and mainspring architecture can be observed during operation.

This gives the movement more visual interaction than a conventional caliber hidden beneath a dial.

The mechanical construction itself should remain the focus of the technical description rather than unsupported comparisons with an original manufacture caliber.

316L Stainless Steel Case

The case is constructed from 316L stainless steel.

Its supplied finishing combines brushed and polished surfaces, creating contrast across different areas of the case.

Because these finishes require different surface textures, aggressive refinishing should be avoided.

Excessive polishing can soften case edges and reduce the distinction between brushed and polished areas.

Curved Case Profile

The case incorporates a curved profile designed to follow the wrist.

This is especially relevant to Franck Muller-style case architecture because the longitudinal curvature can substantially influence how a relatively large watch feels during wear.

No exact case width, length or thickness was supplied for this configuration, so those measurements are intentionally omitted.

They should be added once actual measurements are available.

Slim Case Construction

The supplied information describes the case as having a relatively slim profile.

However, because no measured thickness was provided, the page should not attach an estimated millimeter figure to this description.

For future QC documentation, measuring case thickness with calipers would provide substantially more useful information than simply describing the case as ultra-thin.

Domed Sapphire Crystal

The watch uses a domed sapphire crystal.

Its curved profile follows the overall case architecture while providing a clear view of the openworked movement beneath it.

Sapphire offers high resistance to normal surface scratching but remains susceptible to damage from concentrated impacts.

No confirmed anti-reflective coating specification was supplied.

Transparent Caseback

A transparent caseback provides a rear view of the mechanical movement.

Together with the openworked front architecture, this allows the movement to be examined from both sides.

The twin-barrel structure, bridges and other mechanical components therefore become an important part of the watch’s overall visual identity.

The exact rear crystal material was not separately specified, so it should not automatically be described as sapphire unless confirmed.

Italian Calfskin Leather Strap

The watch is supplied with an Italian calfskin leather strap.

Calfskin provides a softer and more flexible wearing surface than a metal bracelet while complementing the curved case profile.

The leather should be protected from prolonged exposure to water, sweat and high humidity.

The claim that the leather itself is “waterproof” is not retained because untreated or conventionally finished calfskin should not be treated as waterproof without a specific material specification.

Two Case Options

The supplied information indicates that two case configurations are available.

Because the exact differences between those two versions were not provided, they should remain options within the same product page until their materials, finishes, dimensions or references can be confirmed.

Creating two nearly identical pages based only on an unspecified case variation would provide little SEO or technical value.

Product Specifications

Item Specification
Factory ABF Factory
Brand Franck Muller
Watch Type Skeleton Tourbillon
Movement Openworked Tourbillon
Winding Manual
Jewels 25
Barrel Configuration Twin Mainspring Barrels
Power Reserve Approx. 72 Hours Specification
Case Material 316L Stainless Steel
Case Finish Brushed / Polished
Case Profile Curved
Front Crystal Domed Sapphire
Caseback Transparent
Strap Italian Calfskin Leather
Case Options Two Configurations
Style Openworked Mechanical Watch

Openworked Movement Architecture

The combination of tourbillon regulation, twin barrels and skeletonized construction provides this model with a substantially different technical identity from the previous ABF Vanguard Yachting V45.

The movement is not simply visible through the rear of the watch. Its mechanical architecture forms a significant part of the dial-side appearance.

This makes movement finishing, bridge alignment, visible screws and the tourbillon assembly particularly important areas during visual QC.

Twin Barrels and Power Delivery

The two mainspring barrels store the mechanical energy required to operate the movement.

The supplied 72-hour power reserve should ideally be verified on individual watches through a full-duration running test.

For example, the movement can be fully wound, the start time documented, and the watch subsequently observed until it stops.

This provides actual QC data rather than relying exclusively on the nominal 72-hour specification.

Movement QC Priorities

For this model, movement QC is particularly important because so much of the caliber remains visible.

Inspection should include the tourbillon cage operation, winding feel, visible barrel behavior, hand clearance and general movement operation.

Timekeeping should also be checked after the movement has received sufficient winding.

Because no individual timing figures were supplied, daily rate, amplitude and beat error are not invented for this product page.

Case and Crystal QC

The curved 316L steel case should be inspected under directional lighting to evaluate the transitions between brushed and polished surfaces.

The domed sapphire crystal should be checked for scratches, chips and installation irregularities.

The transparent caseback should also be inspected for optical clarity and secure installation.

Actual case dimensions and weight would be valuable additions to a future individual QC report.

Wearing and Care Advice

Wind the manual movement gently and avoid applying additional force once clear resistance is reached.

Protect the tourbillon watch from strong impacts and strong magnetic fields.

Use a clean microfiber cloth for routine cleaning of the case and crystal.

Avoid aggressive polishing of the steel case because this can alter the distinction between brushed and polished surfaces.

Keep the calfskin leather strap away from prolonged moisture exposure.

No water-resistance depth or pressure-test result was supplied for this model. Intentional water exposure should therefore be avoided unless the individual watch has been appropriately pressure tested.

Frequently Asked Questions

What movement does this ABF Franck Muller use?
It uses a 25-jewel openworked manual-winding tourbillon movement with twin mainspring barrels.

What is the supplied power reserve?
The supplied specification is approximately 72 hours from a full wind. Individual running duration can vary and should be verified through QC testing.

Is the watch automatic?
No. This configuration uses a manual-winding mechanical movement.

What is the purpose of the twin barrels?
The two mainspring barrels store energy for the mechanical movement and form part of the architecture associated with the supplied extended power reserve.

What material is the crystal?
The front crystal is specified as domed sapphire. The material of the transparent rear crystal was not separately confirmed.

What size is the watch?
Exact case dimensions were not supplied in this material, so no width, length or thickness is estimated. Actual measurements should be added once available.

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