The Sea-Gull Master Series Open Heart is a mechanical wristwatch built around the ST2505 automatic movement with 38 jewels and a 21,600 vph frequency. Its 42mm round 316L stainless steel case houses an open-heart dial that reveals the running movement, alongside a date calendar and an energy indicator that shows the state of the mainspring wind.
A synthetic sapphire crystal protects the dial, while the leather strap with pin buckle fits wrists up to approximately 7.5 inches. With 5 bar water resistance, it suits daily wear, and the watch carries a 2-year warranty.
Key Features
Brand
Sea-Gull
Collection
Master Series
Model Number
819.42.6128/819.72.6128
Item Type
Mechanical Wristwatch
Movement
ST2505
Number of Jewels
38
Movement Frequency
21600
Winding Mode
Automatic Winding
Case Material
316L Stainless Steel
Crystal Material
Synthetic Sapphire
Case Thickness
Approx. 0.6 in
Case Diameter
Approx. 1.7 in
Case Shape
Round
Lug-to-Lug
Approx. 2 in
Strap Material
Leather
Clasp
Pin Buckle
Strap Length
Approx. 7.5 in
Strap Width
Approx. 0.9 in
Waterproof
5 Bar
Feature
Calendar
Net Weight
2.9 oz
Warranty
2 Years
Origin
Mainland China
Highlights
Open heart dial revealing the ST2505 automatic movement
Date calendar and energy indicator
316L stainless steel case with synthetic sapphire crystal
Leather strap with pin buckle
5 bar water resistance
What's included
Sea-Gull Master Series Open Heart watch
Carton box
Frequently asked questions
What movement powers this watch?
It uses the ST2505 automatic winding movement with 38 jewels and a frequency of 21,600 vph.
What is the water resistance rating?
The watch is rated to 5 bar, suitable for everyday contact with water such as hand washing.
What are the case dimensions?
The round case measures approximately 1.7 inches in diameter and 0.6 inches in thickness, with a lug-to-lug distance of about 2 inches.
What is included with the watch?
It comes in a carton box and is covered by a 2-year warranty.
