CHAPTERS IN THIS JOURNAL
01 / THE PHYSICS OF THE DEEP
Thirty bar. One square centimetre. An extraordinary amount of pressure.
On the specified 43 mm Seastar 1000 Powermatic 80, Tissot lists water resistance up to 30 bar / 300 m / 1,000 ft. Thirty bar equals approximately three million pascals. Expressed as weight-equivalent force, that is about 30.6 kilograms-force acting on every 1 cm² of surface.
This is a scientific way of illustrating pressure, not a 30 kg object pressing on the whole watch, and not an invitation to perform DIY pressure tests. The rating describes resistance under specified conditions; safe real-world use depends on gaskets, crown position, maintenance and professional dive-safety practices.
A SMALL AREA. A REMARKABLE FORCE.
The silent force of the ocean.
This figure represents the pressure equivalent of the stated 30 bar rating. It explains why a dive-style watch requires controlled engineering: a secure case, a screw-down crown, precisely fitted seals and careful assembly.
Explore the construction ↓02 / THE POWERMATIC 80 MOVEMENT
The sophisticated mechanical heart that keeps the story moving.
The Powermatic 80 is the Seastar's silent achievement: a Swiss automatic mechanical movement that draws winding energy from the wearer's wrist rather than a quartz battery. Tissot's engineering development provides up to 80 hours of autonomy when fully wound. Its Nivachron™ balance spring, on the specified 43 mm reference, improves resilience to everyday magnetic fields.
Up to 80 hours of power reserve—long enough to set the watch down for more than three days.
A frequency of three full oscillations per second in the relevant Powermatic 80 movement.
Half-oscillations per 24 hours at 3 Hz: a precise calculation, not an accuracy certification.
A self-winding rotor transmits wrist motion into mainspring energy.
This reference is a high-quality mechanical engineering solution—not an infallible or chronometer-certified precision claim. Powermatic 80 specifications and materials must be confirmed by exact reference.
03 / AN IDENTITY BORN IN 1952
The Seastar name is older than the modern dive watch.
Tissot's experiments with water-resistant watches date back to the 1930s. From there grew a name that would become emblematic of the company's pursuit of resilience. The Seastar trademark was registered in 1952, long before today's Powermatic 80 diver references.
Camping
An early step in Tissot's water-resistant watch development.
Aquasport
Further experimentation with robust, water-resistant watches.
Seastar
The iconic Seastar name was registered as a trademark.
Powermatic 80
The long-running Swiss automatic movement family enters the story.
Seastar 1000
300 m water resistance and modern automatic watchmaking together.
Historical distinction: the 1978 Tissot design later revived as the PRX belonged to the broad Seastar family of that era. It is not the same product as the contemporary Seastar 1000 Powermatic 80.
04 / MATERIALS & ENGINEERING
Designed around real components, not just a promise.
For the reference T120.407.11.041.03, the 43 mm Seastar blends deliberate materials, secure sealing and refined modern finishing. Technical choices that reward a closer look.
30 BAR
The watch is rated to a pressure of 30 bar—equivalent to roughly 300 metres / 1,000 feet of water resistance under the stated test standard.
80 HOURS
The Powermatic 80 automatic movement delivers a nominal power reserve of up to 80 hours when fully wound. That is more than three days.
316L STEEL
The reference uses 316L stainless steel for its case: a robust, corrosion-resistant construction suited to a sport-watch lifestyle.
SAPPHIRE CRYSTAL
Scratch-resistant sapphire crystal protects the face, with an anti-reflective layer on the specified 43 mm blue variant.
SCREW-DOWN CROWN
A screwed crown and caseback form part of the robust construction supporting its water-resistance rating.
NIVACHRON
A patented Nivachron balance spring helps limit the influence of everyday magnetic fields on the regulating organ.
UNIDIRECTIONAL BEZEL
The diver-style timing bezel is designed to rotate in one direction, providing a conservative elapsed-time reading.
SUPER-LUMINOVA
Luminous hour markers and hands improve visibility in low light after they have been exposed to light.
05 / EDITORIAL PHOTO JOURNAL
Seven photographs. The many faces of Seastar.
Every photograph you supplied has a place in this editorial: technical macro, automatic sport-watch photography and the wider Seastar family's chronograph, colour and lifestyle interpretations. Use the numbered controls or arrows, or let the gallery cycle automatically.
Model clarity: some photos in this gallery show Seastar chronograph or other family variants, not the exact 43 mm Powermatic 80 reference. Technical specifications on this page refer to the identified 43 mm automatic watch.
06 / ONE WATCH, TWO FRAMES
Two angles. One connected story.
Your third and fourth photographs show the same blue-and-red-bezel Seastar chronograph from complementary angles. Their paired presentation reveals how perspective changes the way steel, bezel and dial appear.
PERSPECTIVE I — THE DIAL
PERSPECTIVE II — THE PROFILE
The paired chronograph is pictured here as Seastar-family editorial design inspiration; it is not a Powermatic 80 chronograph.
07 / FROM SURFACE TO SHORE
Colour, stone and water change the character.
The broader Seastar family moves between bold colour and restrained black-and-gold elegance. Different styles. The same fascination with water and the tools of timekeeping.
WATER AS A STAGE
The green chronograph photograph introduces the shimmer and drama of moving water.
COLOUR MEETS THE SEA
A turquoise dial and vivid red surface create an intentionally high-contrast lifestyle image.
STONE AND METAL
The black-and-gold Seastar family interpretation introduces warmth, shade and a quieter luxury.
08 / THE FIFTEEN DISCOVERIES
15 fascinating facts about the Seastar 1000.
History, numbers, materials and mechanical details. Each fact reflects the reference research and keeps family-level distinctions clear.
01 / DISCOVERY
The '1000' is in feet
Seastar 1000 means approximately 1,000 feet, not 1,000 metres. That corresponds to a published 300 m / 30 bar rating.
02 / DISCOVERY
Thirty bar is serious pressure
30 bar means 3 million pascals, equivalent to about 30.6 kilogram-force on each square centimetre of surface—not a literal 30 kg weight on an entire watch.
03 / DISCOVERY
Over three days of reserve
The Powermatic 80 can operate for up to 80 hours once fully wound, making a Friday-to-Monday rest possible.
04 / DISCOVERY
Its roots predate the Seastar name
Tissot worked on water-resistant pieces such as Camping (1938) and Aquasport (1939).
05 / DISCOVERY
An automatic, not a battery
The movement winds its mainspring through the wearer's motion. Quartz Seastar variants use a different technology.
06 / DISCOVERY
Powermatic 80 debuted in 2013
The Tissot/ETA movement family was developed as a longer-reserve evolution of Swiss automatic watchmaking.
07 / DISCOVERY
A 3 Hz regulating frequency
Many Powermatic 80 movements beat at 3 Hz, balancing the mechanical cadence with extended energy autonomy.
08 / DISCOVERY
518,400 semi-oscillations per day
At 3 Hz, the movement makes 6 half-oscillations a second: 21,600 per hour and 518,400 over a day.
09 / DISCOVERY
Nivachron fights magnetism
The Nivachron balance spring in the specified reference is engineered to better resist everyday magnetic interference.
10 / DISCOVERY
Transparency meets water resistance
The 43 mm reference combines a see-through caseback with its 30 bar stated water-resistance rating.
11 / DISCOVERY
One-way rotation is deliberate
A dive-style unidirectional bezel helps prevent accidental changes that would suggest less elapsed time than actually passed.
12 / DISCOVERY
A ceramic detail with a purpose
The selected 43 mm reference has a ceramic bezel ring with scratch-resistant surface properties; it is not indestructible.
13 / DISCOVERY
Light where it matters
Super-LumiNova on the hands and markers supports readability after ambient light fades.
14 / DISCOVERY
Materials built for daily life
316L steel, sapphire, screw-down sealing and precise finishing bring substance behind the aesthetic.
15 / DISCOVERY
The Seastar name arrived in 1952
Tissot registered 'Seastar' as a trademark in 1952, decades before today's 43 mm Powermatic 80 model.
BV WATCHSTORE / CURATED TIMEPIECES
Explore the Seastar 1000 Powermatic 80 Collection.
Dive-inspired confidence and Swiss automatic mechanics. Explore authentic catalogue product listings in several dial colours.
Always check each product reference for availability and its exact bracelet, bezel and movement details.
EXPLORE THE JOURNAL
The deeper you look into a watch, the more fascinating it becomes.
Continue with the 1978 Tissot PRX story or the clock tower that inspired Tissot Le Locle.