
Ultra-Chron
Ref.: L2.836.4.52.6
Vintage vibes with a modern kick, the Longines Ultra-Chron brings back the brand’s iconic high-frequency dive watch from 1968. Its 43mm cushion-shaped stainless steel case houses a black dial with a sapphire bezel insert, keeping things sharp and legible. Under the hood, the high-beat Calibre L836.6 hums at 36,000 vibrations per hour, delivering serious precision with a 52-hour power reserve. With 300m water resistance, it’s a retro diver that’s built to perform.









Case Details
All the info on the case construction, dimensions, shape, and finishing.
- Case Diameter
- 43mm
- Lug-to-Lug Distance
- 49mm
- Lug Width
- 22mm
- Case Thickness
- 13.6mm
- Caseback Style
- Closed Back
- Case Shape
- Cushion
- Case Material
- 316L Stainless Steel
- Case Finishing
- Brushed, Polished
- Weight
- 172.1g
- Water Resistance
- 30 ATM
Movement Details
Technical specs and extras under the hood.
- Movement Type
- Automatic
- Movement Name
- Longines L836
- Frequency
- 36,000 BPH
- Hacking Seconds?
- Yes
- Complications & Features
- Chronometer
- Certifications
-
COSC
COSC is the Official Swiss Chronometer Testing Institute for mechanical watches.
Learn more - Power Reserve
- 52 hours
- Jewels
- 25
- Shock Absorption
- Nivachoc
- Anti-Magnetism
- Silicon Balance Spring
Dial Details
Color, material, lume, and other dial features.
- Lume Type
- Super-LumiNova
- Dial Color
- Black
- Dial Characteristic
- Textured
Bezel Details
Details about bezel materials, insert, action, and type.
- Bezel Material
- Stainless Steel
- Bezel Insert Material
- Sapphire
- Bezel Direction
- Uni-Directional
- Number of Clicks
- 120 Clicks
- Bezel Type
- External Bezel
Crystal Details
Crystal material, type, and coatings.
- Crystal Material
- Sapphire Crystal
- Anti-Reflective Coating?
- Yes
Crown Details
Crown type and any additional crown functions.
- Crown Type
- Screw-Down
General Details
Brand, origin, price range, and more.
- Brand
- Longines
- Country of Origin
- Switzerland
- Watch Type
- Dive Sports
- Price Range (USD)
- $$$