KF Factory Rolex Yacht-Master II 116680 7750 Chronograph Technical Guide

KF Factory Rolex Yacht-Master II 116680 7750 Chronograph Technical Guide

The KF Factory Rolex Yacht-Master II 116680 is a 44mm mechanical sports chronograph based on the distinctive Yacht-Master II platform.

According to the supplied specifications, the KF version measures approximately 44mm in diameter and 14mm in thickness and uses a modified 7750 automatic chronograph movement.

The configuration also features the characteristic Yacht-Master II bezel and dial layout, luminous hands and markers, a functional central chronograph seconds hand and running small seconds at 6 o’clock.

For technical classification, the movement should be understood as a 7750-based modified chronograph architecture, rather than being identified as the movement used in the original Rolex 116680.

44mm Case and 14mm Thickness

The KF Factory 116680 uses the large case proportions associated with the Yacht-Master II design.

The supplied dimensions are:

Case Diameter: 44mm
Case Thickness: Approx. 14mm

The 44mm diameter gives the watch considerably more wrist presence than many conventional Rolex sports-watch configurations.

Its approximately 14mm profile also needs to accommodate the modified automatic chronograph architecture.

For database purposes, these should currently be treated as the supplied specifications. Actual dimensions from an individual watch can be recorded separately in the corresponding QC test.

Yacht-Master II Bezel Architecture

One of the most recognizable features of the Rolex Yacht-Master II 116680 design is its large external bezel with prominent numerals and minute markings.

The supplied KF version describes an updated color-corrected bezel treatment derived from techniques used on other ceramic sports-watch bezels.

The supplied information also describes a platinum-related treatment applied to the bezel markings.

Without independent material verification, it is more accurate to classify this as a platinum-color surface treatment rather than assuming that the numeral filling has been verified as solid platinum.

For technical comparison between versions, the most useful bezel characteristics include:

• Bezel color
• Engraving depth
• Numeral fill
• Surface texture
• Engraving edges
• Alignment
• Transition between the bezel and case

These characteristics can be documented more reliably through controlled macro photography than through general product descriptions.

Dial and Chronograph Layout

The 116680 uses a considerably more complicated dial arrangement than a conventional three-hand sports watch.

The KF configuration combines the main time display with chronograph-related indications and running small seconds.

This makes the position and alignment of the hands particularly important.

When documenting an individual watch, useful details include central-hand alignment, subdial positioning, printing, hour-marker placement and the zero position of the chronograph hand.

Chromalight-Style Luminous Display

The supplied KF specifications describe the dial and hands as using a Chromalight-style luminous display.

Rather than treating the lume name itself as evidence of performance, the useful characteristics to evaluate are:

• Initial brightness
• Luminous color
• Application consistency
• Hand-to-marker color consistency
• Afterglow duration
• Visible application defects

Actual luminous performance can vary between individual watches and is better documented through direct testing.

Functional Central Chronograph Seconds

An important technical characteristic of the KF Factory 116680 is its functional central chronograph seconds hand.

The central chronograph hand is mechanically operated rather than being included only as a decorative display.

Chronograph testing should examine the complete operating cycle:

Start → Run → Stop → Reset

The reset operation is particularly useful for QC because the central hand should return correctly to its starting position.

A functional chronograph should therefore be distinguished from watches where chronograph hands or subdials are primarily decorative.

Running Small Seconds at 6 O’Clock

The KF configuration uses a running small-seconds display at 6 o’clock.

This indication represents continuously running movement seconds and should be distinguished from the central chronograph seconds hand.

The two functions therefore have different roles:

6 o’clock small seconds: continuous movement seconds
Central seconds hand: chronograph timing seconds

This distinction is useful when identifying the movement layout and testing whether the chronograph system is operating correctly.

Modified 7750 Automatic Chronograph Movement

The KF Factory Yacht-Master II 116680 is described as using a modified 7750 automatic chronograph movement.

For technical database classification, the movement is best recorded as:

Base Architecture: 7750

Movement Type: Modified Automatic Mechanical Chronograph

Chronograph: Functional

This classification is more informative than identifying the movement only by its exterior appearance.

The 7750 provides the underlying mechanical platform, while modifications allow the movement and indications to be configured for the Yacht-Master II-style dial arrangement.

Why the 7750 Movement Classification Matters

The movement installed in the KF 116680 should not be confused with the movement architecture used in the original Rolex Yacht-Master II.

Identifying the underlying 7750 architecture is important because it can affect several characteristics of the watch.

Case Thickness

Movement architecture influences the amount of vertical space required inside the case and therefore contributes to the overall watch thickness.

Chronograph Operation

The start, stop and reset functions depend on the chronograph mechanism and should be evaluated mechanically rather than from the dial appearance alone.

Subdial Configuration

Producing the required dial layout can involve modifications to the base movement architecture.

Servicing

Knowing that the movement is based on a 7750 architecture can be useful when considering future maintenance and movement servicing.

For these reasons, the watch should remain classified as a modified 7750-based chronograph within a technical database.

Chronograph Function and Operating Checks

Because this is a functional mechanical chronograph, the chronograph mechanism deserves more attention than a conventional three-hand movement.

The most useful operating checks include:

Start: Confirm that the central chronograph hand begins operating correctly.

Run: Observe whether the chronograph continues operating normally.

Stop: Confirm that the chronograph can be stopped consistently.

Reset: Check whether the central hand returns accurately to its starting position.

The running small seconds at 6 o’clock should also continue to operate independently of the central chronograph seconds hand.

These tests are especially useful on a modified 7750 configuration because actual operation provides more information than the movement designation alone.

Bezel and Dial Details Worth Checking

The 116680 has several visual characteristics that are particularly useful when comparing different production versions.

For the bezel, attention should be given to the engraving, numeral fill, surface finish and alignment.

For the dial, useful details include:

Chronograph hand alignment
Small-seconds positioning
Hour-marker alignment
Luminous application
Printing definition
Hand finishing

These details are better evaluated through high-resolution photographs and individual QC inspection rather than broad claims about overall similarity.

Technical Specifications

Specification Details
Factory KF Factory
Brand Rolex
Collection Yacht-Master II
Reference 116680
Case Diameter 44mm
Case Thickness Approx. 14mm
Bezel Yacht-Master II-Style
Bezel Markings Platinum-Color Surface Treatment
Lume Chromalight-Style
Movement Base 7750 Architecture
Movement Type Modified Automatic Chronograph
Central Chronograph Seconds Functional
Running Small Seconds 6 o’clock
Automatic Winding Yes

Individual QC & Movement Testing

The specifications above describe the general configuration of the KF Factory Rolex Yacht-Master II 116680, while individual movement performance, physical dimensions and chronograph operation can vary between examples.

For first-hand Timegrapher results, measured case dimensions, thickness, weight, chronograph start/stop/reset testing and small-seconds operation, see our KF Factory Rolex Yacht-Master II 116680 QC Test.

FAQ

What is the reference number of the KF Factory Yacht-Master II?

This version is based on the Rolex Yacht-Master II Ref. 116680.

What size is the KF Factory Rolex 116680?

The supplied specifications list a 44mm case diameter and approximately 14mm case thickness.

What movement does the KF Yacht-Master II 116680 use?

The KF version uses a modified 7750-based automatic mechanical chronograph movement.

Is the KF 116680 movement the same as the original Rolex movement?

No. The KF version uses a modified 7750-based architecture and should not be classified as mechanically identical to the movement used in the original Rolex Yacht-Master II 116680.

Is the central seconds hand functional?

According to the supplied configuration, the central chronograph seconds hand is functional. Start, stop and reset operation should be checked on the individual watch.

What does the subdial at 6 o’clock display?

The supplied KF configuration uses the 6 o’clock position for running small seconds, which operates separately from the central chronograph seconds hand.