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Jaeger-LeCoultre · Master Control

Jaeger-LeCoultre Master Control Date

Reference Q4018421 · Classic · 40 mm

1212456789101114Ø 40 mm
Illustration drawn from the specifications: case to scale, colours and style approximate. Not a photo. Photos on the official page

Specifications

Reference
Q4018421
Family
Master Control
Category
Classic
Status
Current
Case material
Stainless steel
Case diameter
40 mm
Case thickness
8.78 mm Official
Lug-to-lug
—
Lug width
—
Water resistance
50 m
Bezel
—
Calibre
899 Official
Power reserve
70 h
Frequency
28,800 vph (4 Hz)

Official product page · retrieved October 16, 2026

Does it fit your wrist?

Enter your wrist circumference. The watch appears to scale on the flat top of the wrist.

1212456789101114No lug-to-lug dataFlat top of the wrist 54.1 mm
Top view on a wrist, to scale
Flat top of the wrist 54.1 mmNo lug-to-lug dataCase diameter 40 mm
Side view, across the wrist

No lug-to-lug figure exists for this reference yet, so fit cannot be computed.

Measurements and sources

Brands rarely publish thickness, lug width and lug-to-lug together. Each observation below is kept separate, with who gave it.

Case thickness

Value Type Source Date
8.78 mm Official Jaeger-LeCoultre October 16, 2026

Lug-to-lug

No source gave this figure yet.

Lug width

Lug width is the gap between the lugs, where the strap fits. It is not lug-to-lug.

No source gave this figure yet.

Calibre source

Official Jaeger-LeCoultre · retrieved October 16, 2026

Other versions in the same case

These references differ only by dial, bracelet or bezel colour. The brand gives them the same case dimensions, so the figures on this page apply to them too.

Other Master Control references

Watch Ø Thickness Lug-to-lug Calibre
Master Control Calendar Q4148120 40 mm 10.95 mm — 866
Master Control Memovox Q411843J 40 mm 12.39 mm — 956
Master Control Chronograph Calendar Q4138130 40 mm 12.05 mm — 759
Master Control Geographic Q4128421 40 mm 10.96 mm — 939

Other Jaeger-LeCoultre models

Watch Ø Thickness Lug-to-lug Calibre
Master Ultra Thin Date Q1238421 39 mm 7.89 mm — 899
Master Ultra Thin Moon 39 mm Q1368430 39 mm 9.3 mm — 925
Master Ultra Thin Perpetual Calendar Q114842J 39 mm 9.2 mm — 868
Master Ultra Thin Small Seconds Q1218420 39 mm 8.1 mm — 896
Master Ultra Thin Moon 36 mm Q1248420 36 mm 9.4 mm — 925
Rendez-Vous Classic Moon Q3578131 34 mm 9.42 mm — 925
Show 20 more
Watch Ø Thickness Lug-to-lug Calibre
Rendez-Vous Classic Night & Day Q3448111 34 mm 8.63 mm — 898
Reverso Classic Duoface Small Seconds 42.9 × 25.5 mm Q2458422 25.5 mm 10.31 mm 42.9 mm 854
Reverso Classic Duoface Small Seconds 47 × 28.3 mm Q3848422 28.3 mm 10.34 mm 47 mm 854
Reverso Classic Monoface 35.78 × 21 mm Q2618540 21 mm 7.4 mm 35.78 mm 657
Reverso Classic Monoface 40.1 × 24.4 mm (calibre 657) Q2518140 24.4 mm 7.56 mm 40.1 mm 657
Reverso Classic Monoface 40.1 × 24.4 mm (calibre 822) Q2548140 24.4 mm 7.56 mm 40.1 mm 822
Reverso Classic Monoface Small Seconds Q2438522 25.5 mm 7.46 mm 42.9 mm 822
Reverso Tribute Duoface Calendar Q3918420 29.9 mm 10.9 mm 49.4 mm 853
Reverso Tribute Duoface Small Seconds Q3988482 28.3 mm 10.3 mm 47 mm 854
Reverso Tribute Duoface Tourbillon Q392845J 27.4 mm 9.14 mm 45.5 mm 847
Reverso Tribute Monoface Q7168420 24.4 mm 7.56 mm 40.1 mm 822
Reverso Tribute Small Seconds Q397848J 27.4 mm 8.51 mm 45.6 mm 822
Polaris Automatic Q9008170 41 mm 11.2 mm — 898
Polaris Perpetual Calendar Q9088180 42 mm 13.07 mm — 868
Polaris Chronograph (calibre 751) Q9028170 42 mm 11.92 mm — 751
Polaris Chronograph (calibre 761) Q9028181 42 mm 13.39 mm — 761
Polaris Date Q906863J 42 mm 13.92 mm — 899
Polaris Geographic Q9078640 42 mm 11.54 mm — 939
Polaris Mariner Date Q9068180 42 mm 13.92 mm — 899
Polaris Mariner Memovox Q903818J 42 mm 15.63 mm — 956

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