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A. Lange & Söhne · Datograph

A. Lange & Söhne Datograph Perpetual Tourbillon

Reference 740.056 · Chronograph · 41.5 mm

Ø 41.5 mm
Illustration drawn from the specifications: case to scale, colours and style approximate. Not a photo. Photos on the official page

Specifications

Reference
740.056
Family
Datograph
Category
Chronograph
Status
Current
Case material
18 ct white gold
Case diameter
41.5 mm
Case thickness
14.6 mm Official
Lug-to-lug
—
Lug width
—
Water resistance
30 m
Bezel
—
Calibre
L952.2 Official
Power reserve
50 h
Frequency
18,000 vph (2.5 Hz)

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.

No 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 41.5 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
14.6 mm Official A. Lange & Söhne 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.

No source gave this figure yet.

Calibre source

Official A. Lange & Söhne · retrieved October 20, 2026

Other Datograph references

Watch Ø Thickness Lug-to-lug Calibre
Datograph Perpetual 410.038 41 mm 13.5 mm — L952.1
Datograph Perpetual Tourbillon Honeygold “Lumen” 740.055 41.5 mm 14.6 mm — L952.4
Datograph Handwerkskunst 405.048 41 mm 13.1 mm — L951.8
Datograph Up/Down 405.035 41 mm 13.1 mm 48.4 mm L951.6

Other A. Lange & Söhne models

Watch Ø Thickness Lug-to-lug Calibre
1815 Rattrapante 425.025 41.2 mm 12.6 mm — L101.2
1815 Rattrapante Perpetual Calendar 421.025 41.9 mm 14.7 mm — L101.1
Odysseus Chronograph 463.178 42.5 mm 14.2 mm — L156.1
1815 Chronograph 414.026 39.5 mm 11 mm 48.4 mm L951.5
Triple Split 424.025 43.2 mm 15.6 mm — L132.1
Odysseus 363.179 40.5 mm 11.1 mm 47 mm L155.1
Show 41 more
Watch Ø Thickness Lug-to-lug Calibre
Odysseus Honeygold 363.150 40.5 mm 11.1 mm — L155.1
Lange 1 Time Zone 136.025 41.9 mm 10.9 mm — L141.1
Richard Lange Tourbillon "Pour le Mérite" 760.026 41.9 mm 12.2 mm — L072.1
Richard Lange "Pour le Mérite" 260.028 40.5 mm 10.7 mm — L044.1
Lange 1 Perpetual Calendar 345.036 41.9 mm 12.1 mm — L021.3
Lange 1 Tourbillon Perpetual Calendar 720.032 41.9 mm 12.2 mm — L082.1
Lange 1 Tourbillon Perpetual Calendar “Lumen“ 720.035 41.9 mm 13 mm — L225.1
Zeitwerk 142.025 41.9 mm 12.2 mm — L043.6
Zeitwerk Honeygold “Lumen” 142.055 41.9 mm 12.6 mm 50 mm L043.9
Grand Lange 1 137.033 41 mm 8.2 mm — L095.1
Grand Lange 1 Moon Phase 139.025 41 mm 9.5 mm — L095.3
1815 Annual Calendar 238.026 40 mm 10.1 mm 46.6 mm L051.3
Saxonia Moon Phase 384.026 40 mm 9.8 mm 46.8 mm L086.5
Richard Lange Jumping Seconds 252.029 39.9 mm 10.6 mm — L094.1
Minute Repeater Perpetual 607.091 40.5 mm 12.1 mm — L122.2
Richard Lange 232.032 40.5 mm 10.5 mm — L041.2
Saxonia Thin (40 mm, platinum) 211.062 40 mm 6.2 mm — L093.1
Saxonia Thin (39 mm) 205.086 39 mm 6.2 mm — L093.1
1815 Tourbillon 730.032 39.5 mm 11.1 mm — L102.1
Lange 1 Daymatic Honeygold 320.050 39.5 mm 10 mm — L021.1
Lange 1 Moon Phase 192.029 38.5 mm 10.2 mm 47 mm L121.3
1815 Up/Down (39 mm, pink gold) 234.032 39 mm 8.7 mm 45 mm L051.2
Richard Lange Minute Repeater 606.079 39 mm 9.7 mm — L122.1
Zeitwerk Date 148.033 44.2 mm 12.3 mm — L043.8
Zeitwerk Minute Repeater 147.025 44.2 mm 14.1 mm — L043.5
Zeitwerk Minute Repeater Honeygold 147.050 44.2 mm 14.1 mm — L043.5
1815 (calibre L051.1) 235.032 38.5 mm 8.8 mm — L051.1
Lange 1 191.032 38.5 mm 9.8 mm — L121.1
Lange 1 (platinum, calibre L901.0) 101.025 38.5 mm 10 mm — L901.0
Langematik Perpetual 310.032 38.5 mm 10.2 mm — L922.1
Saxonia Outsize Date 381.031 38.5 mm 9.6 mm — L086.8
Lange 31 130.039 45.9 mm 15.9 mm — L034.1
Little Lange 1 Moon Phase (white gold) 182.086 36.8 mm 10 mm 43.8 mm L121.2
1815 Up/Down (37.5 mm, pink gold) 244.037 37.5 mm 8.7 mm — L051.2
Richard Lange Perpetual Calendar "Terraluna" 180.032 45.5 mm 16.5 mm — L096.1
Saxonia Thin (37 mm, pink gold) 201.033 37 mm 5.9 mm — L093.1
Little Lange 1 181.063 36.8 mm 9.5 mm — L121.1
Little Lange 1 (platinum) 181.062 36.8 mm 10 mm — L121.1
Little Lange 1 Moon Phase (pink gold) 182.030 36.8 mm 9.5 mm — L121.2
Saxonia Annual Calendar 331.033 36 mm 9.8 mm — L207.1
1815 (calibre L152.1) 220.037 34 mm 6.4 mm — L152.1

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