Seiko Cronos
Luxury Waterproof Watches
The Seiko Cronos luxury waterproof wristwatch, which we have been researching for some time, is finally going on sale.
The specially constructed watch case and specially designed glass can withstand water pressure up to 50 meters. Skiing, skating, mountaineering in winter, swimming in summer, and you can use it safely for everyday water work.
Structure
This watch has a stainless steel watch case and glass. The housing is specially designed to maintain sufficient waterproofness, and the packing has a special shape called a O-ring.
Let’s take a look at the back cover. (Drawing) The large gasket is the so-called O-ring. Insert this O-ring between the center (1), middle frame, and case back, and compress it using the case back press. Since the back cover holder is screwed in, the O-ring can be compressed with extremely large force, making it 100% waterproof.
Let’s briefly calculate the force applied to the glass. If the pressure is about 5 atmospheres (approx. 5 kg / cm2), and the diameter of the glass is about 3.2 cm, so 1.62 x 3.14 x 5 = 40 (kg). Therefore, the glass must withstand such a large force. The glass used in Seiko Cronos luxury waterproof watches is extremely strong and resistant to moisture absorption. The small gasket used in the crown is also an O-ring. The crown with an O-ring is not only extremely waterproof, but also rotates very smoothly.
Instrument
The watch is a Seiko Cronos with 3 hands and 23 jewels, and has already gained a reputation for its authentic thin design and accuracy. Of course, it is equipped with diashock, an earthquake-resistant device that will not go awry even if dropped or bumped, and it uses a durable mainspring.
Tests
This watch has passed various tests at our factory, including a decompression test, a pressurization test, and a condensation test, to ensure that it can withstand a pressure of 5 atmospheres. Therefore you can demonstrate it, in this state, it is sufficiently waterproof even under 50 meters of water.
Precautions when Selling
Although it is most important to carefully follow the precautions on the watch, this watch is designed in a way that allows you to easily adjust the time, replace the gaskets, etc. at a watch store by opening the case back.
Exploded View of Waterproof Case