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Montblanc · Montblanc 1858

Montblanc 1858 The Unveiled Timekeeper Minerva 42.5 mm

Reference MB133246 · Chronograph · 42.5 mm

1212456781011Ø 42.5 mm
Illustration drawn from the specifications: case to scale, colours and style approximate. Not a photo. Photos on the official page

Specifications

Reference
MB133246
Family
Montblanc 1858
Category
Chronograph
Status
Current
Case material
Stainless steel
Case diameter
42.5 mm
Case thickness
13.85 mm Official
Lug-to-lug
—
Lug width
21 mm Official
Water resistance
30 m
Bezel
—
Calibre
MB M13.21 Official

Official product page · retrieved October 20, 2026

Does it fit your wrist?

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

1212456781011No 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 42.5 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
13.85 mm Official Montblanc Published as the case height. October 20, 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.

Value Type Source Date
21 mm Official Montblanc October 20, 2026

Calibre source

Official Montblanc · retrieved October 20, 2026

Other Montblanc 1858 references

Watch Ø Thickness Lug-to-lug Calibre
Montblanc 1858 Minerva Monopusher Chronograph Red Arrow 42 mm MB129614 42 mm 13.15 mm — MB M13.21
Montblanc 1858 The Unveiled Secret Minerva Monopusher Chronograph 43 mm MB129613 43 mm 14.18 mm — MB M16.29
Montblanc 1858 Split Second Chronograph 44 mm MB134029 44 mm 15.2 mm — MB M16.31
Montblanc 1858 Automatic Date 0 Oxygen 41 mm MB134339 41 mm 11.3 mm — MB 24.17
Montblanc 1858 Annual Calendar Geosphere 42 mm MB134026 42 mm 13.3 mm — MB M14.58
Montblanc 1858 Geosphere 0 Oxygen 42 mm MB133303 42 mm 12.8 mm — MB 29.25
Montblanc 1858 GMT 0 Oxygen 42 mm MB136523 42 mm 12.25 mm — MB 24.33
Montblanc 1858 Small Second 0 Oxygen 38 mm MB136355 38 mm 11.7 mm — MB 24.16
Montblanc 1858 Geosphere 0 Oxygen Mount Vinson 43.5 mm MB134019 43.5 mm 13 mm — MB 29.25

Other Montblanc models

Watch Ø Thickness Lug-to-lug Calibre
Montblanc Star Legacy Chronograph 42 mm (calibre MB 24.31) MB133245 42 mm 14.29 mm — MB 24.31
Montblanc Star Legacy Chronograph 42 mm (calibre MB 25.13) MB136357 42 mm 14.29 mm — MB 25.13
Montblanc Star Legacy Nicolas Rieussec Chronograph 43 mm MB129764 43 mm 15.01 mm — —
Minerva The Unveiled Secret 39 mm MB136354 39 mm 14.18 mm — MB M13.26
Montblanc Star Legacy Orbis Terrarum 43 mm MB128675 43 mm 13.84 mm — —
Montblanc Iced Sea 0 Oxygen Deep 4810 43 mm MB133268 43 mm 19.4 mm — MB 29.29
Show 9 more
Watch Ø Thickness Lug-to-lug Calibre
Montblanc Iced Sea Automatic Date 41 mm MB129369 41 mm 12.9 mm — —
Montblanc Star Legacy Automatic Date 42 mm MB128681 42 mm 10.6 mm — MB 24.17
Montblanc Star Legacy Full Calendar 42 mm MB128676 42 mm 11.38 mm — MB 24.30
Montblanc Star Legacy Moonphase 42 mm MB134297 42 mm 11.38 mm — MB 24.31
Minerva The Unveiled Crownless 41.5 mm MB137544 41.5 mm 11.99 mm — MB 15.08
Montblanc Iced Sea Automatic Date 0 Oxygen 38 mm MB134022 38 mm 12.3 mm — —
Montblanc Tradition Automatic Date 40 mm MB131274 40 mm 8.57 mm — —
Montblanc Star Legacy Automatic Day & Date 39 mm MB128686 39 mm 10.29 mm — MB 24.28
Montblanc Tradition Automatic Date 32 mm MB132317 32 mm 8.63 mm — —

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