Longines The Master Collection L2.920.4.78.6
Ref. L2.920.4.78.6 · Silver "barleycorn" dial · In production
- Case42 mm
- Thick10.8 mm
- Lug-to-lug49.7 mm
- Water res.30 m
- MovementAutomatic
- CrystalSapphire
Longines The Master Collection L2.920.4.78.6 size, specs and price at a glance
The Longines The Master Collection L2.920.4.78.6 is 42 mm wide and 10.8 mm thick, with a lug-to-lug length of 49.7 mm. It takes 21 mm straps and ships on a bracelet. Inside is the L897.2 automatic calibre, water resistant to 30 m. US list price: $3,000 when we last checked longines.com (3 Nov 2026).
Strap shopping? See our Longines lug width chart.
Overview
The Longines L2.920.4.78.6 is an everyday watch from the Master collection, part of the The Master Collection family. It has a 42 mm stainless steel case, 10.8 mm thick, 49.7 mm from lug to lug. Longines lists the dial as silver "barleycorn". Inside is an automatic movement (calibre L897.2) with 72 h of power reserve. You also get 30 m water resistance, a sapphire crystal and a bracelet.
Who it suits
- Wrists of roughly 16.8–18.7 cm (6.6–7.4 in), by our Watch Finder sizing guide
- Desk and dress wear (keep it away from swimming)
- Shirt cuffs and smarter dress codes
Strengths
- Sapphire crystal resists scratches
- 72 h power reserve survives a weekend off the wrist
- Slim at 10.8 mm
Trade-offs
- Only 30 m water resistance: splash-proof, not for swimming
Written by Watch.co from the published specs below. These are not owner reviews.
Full specifications
Case
| Case diameter | 42 mm | longines.com · 3 Nov 2026 |
|---|---|---|
| Thickness | 10.8 mm | longines.com · 3 Nov 2026 |
| Lug-to-lug | 49.7 mm | longines.com · 3 Nov 2026 |
| Case material | Stainless steel | longines.com · 3 Nov 2026 |
| Crystal | Sapphire | longines.com · 3 Nov 2026 |
| Water resistance | 30 m | longines.com · 3 Nov 2026 |
| Weight | 164.1 g | longines.com · 3 Nov 2026 |
Dial
| Dial colour | Silver "barleycorn" | longines.com · 3 Nov 2026 |
|---|---|---|
| Date | Date | longines.com · 3 Nov 2026 |
Movement
| Movement type | Automatic | longines.com · 3 Nov 2026 |
|---|---|---|
| Calibre | L897.2 | longines.com · 3 Nov 2026 |
| Power reserve | 72 h | longines.com · 3 Nov 2026 |
Strap / Bracelet
| Bracelet / strap | Bracelet | longines.com · 3 Nov 2026 |
|---|---|---|
| Lug width | 21 mm | longines.com · 3 Nov 2026 |
Other
| US list price (MSRP) | $3,000 | longines.com · 3 Nov 2026 |
|---|---|---|
| Production status | In production | longines.com · 3 Nov 2026 |
| Style (our classification) | Everyday | our classification |
Specs are summarised in our own words from the brand's product page. Each row links its source and the date we checked it. Fields we haven't verified are left out rather than guessed.
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Questions about the Longines The Master Collection L2.920.4.78.6
How big is the Longines The Master Collection L2.920.4.78.6?
The case is 42 mm wide, 10.8 mm thick and 49.7 mm from lug to lug.
What movement does the Longines The Master Collection L2.920.4.78.6 use?
It uses the L897.2 calibre, a automatic movement with 72 h of power reserve.
Can I swim with the Longines The Master Collection L2.920.4.78.6?
Not really. It is rated to 30 m.
Does the Longines The Master Collection L2.920.4.78.6 have a date?
Yes, it shows the date.
How much is the Longines The Master Collection L2.920.4.78.6?
The US list price was $3,000 on longines.com when we checked on 3 Nov 2026. Prices change, so check before you buy.
Will the Longines The Master Collection L2.920.4.78.6 fit my wrist?
By our sizing guide it sits best on wrists of about 16.8–18.7 cm (6.6–7.4 in). Use the fit checker on this page to test your own wrist.
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