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In the civilian world, the most common timekeeping system is the 12-hour dial, which shows the same time twice a day. Therefore, two similar notations should be distinguished by different notations: AM and PM. This makes it easy to confuse timeframes.

In the military arena, confusion about the meaning of time can be deadly. Therefore, the military had to improvise a timing system that would reduce the possibility of ambiguity. This introduced the military time system, also known as the 24-hour clock system.

Soldiers often used devices for long-range communication to enhance their cohesion, offensive, and defensive strategies. A slight error in information can lead to wrong actions. This was one of the drawbacks of the 12-hour clock. For instance, in the 12-hour system, it is very easy to confuse 12 midnight and 12 noon. It is also very difficult in to do swift calculations in time difference. For example, in the 12-hour system, it is harder to know that something lasts for six-hour when told it starts from 10:45 to 4:45. On the contrary, it is easier to comprehend that it starts from 10:45 to 16:45. For these challenges in the 12-hour system, the US Navy adopted the 24-hour system in 1920 which was later adopted by the US Army in 1942. However, the 24-hour clock was used informally by the Army and Navy in the latter half of World War I. Evidence of this can be found on the few dials of World War I American trench clocks.

The 12-hour clock is still widely used in the United States today. The 24-hour system is also popular with airlines and other transit agencies where mistiming can cause confusion. Pilots, scientists and polar explorers employ his 24-hour clock. This is most likely due to the sun shining or being dark in that location for a long period of time. Night, which takes up most of the day, can be confusing for explorers. Professionals with highly sensitive operations, such as hospitals and intensive care units, also provide care around the clock. A small mistake in drug administration can lead to patient death.

While the world adapts, adapts, and optimizes its systems to meet the needs of new technologies and methods, the history of the military era continues to be written.

The Steeldive VH60 SF746 is a state-of-the-art instrument for professional pilots, designed for reliability and accuracy to meet current aviation specifications, with a 39 mm diameter dial for enhanced legibility. Subtle but significant design evolutions in the case, bezel, lugs and dial make the 39mm Steel Dive VH60 SF746 a modern pilot's watch rather than a remake of the original. Strictly in its original black and white paint scheme and without the patina that often twists the perception of historic watches.

Watch Specification
Model: SF746
Movement type: Sweep second quartz movement
Movement model: VH60
Battery model: SR920SW（2 years)
Case material: 316L stainless steel
Case back: 316L stainless steel
Watch mirror: flat sapphire crystal with AR coating.
Water resistance: 200m / 20 ATM
Luminous: Swiss C3 green and BGW9 blue super luminous.
Crown: Screwdown Crown
Case back: Screwback Case
Clasp: 3 inner hold adjustable clasp
Watch Dimension
Case diameter:39mm ( without crown)
Case length: 49mm (lug to lug)
Case thickness: 12mm 
Lug width: 20mm 

The SD1993 NH34 is a remarkable mechanical watch from Steeldives that I highly recommend to any mechanical watch enthusiast.  This brand is known for its traditional craftsmanship that creates high-quality, high-performance, and high-value mechanical watches.  Let me tell you more about this watch in detail.

 First, let's talk about its appearance.  This watch features a circular dial with a diameter of 41mm, making it a perfect size for most wrists.  The main color of the dial is black, giving it a sleek and sophisticated look.  The hands and markers are beautifully crafted and highly refined, and the outer rim of the dial has a gear-like texture, which adds depth to the watch's overall design.  

The watch's case and band are made of stainless steel metal, ergonomic design suitable for wear, wear and comfort.  Clear sapphire crystal glass, no matter any Angle, can clearly read the time.  Tight bottom screw bottom cover design, can firmly protect the internal movement structure, waterproof depth up to 300 meters, suitable for most underwater activities. 

Let's now discuss its performance. With its self-designed NH34 movement, which includes a revolutionary shock-absorbing system and a highly effective winding mechanism, this watch offers accurate and reliable timekeeping. The watch also includes a special GMT feature that shows two time zones concurrently in a striking color scheme that is both functional and aesthetically pleasing. Additionally, the watch has a luminous feature that makes the hands and hour markers shine in the dark, making it simple to tell the time even in dim lighting. The watch is suitable for the majority of aquatic sports because it is water-resistant up to 300 meters.

A reputable brand to purchase from is Steeldives, a well-known Chinese watch company that promotes social responsibility and environmental sustainability in addition to superb craftsmanship. The company is dedicated to the history and innovation of mechanical watches and frequently debuts new designs and features that broaden public awareness of and affection for these timepieces.

In conclusion, the SD1993 NH34 is an outstanding mechanical watch from Steeldives that I highly recommend.  It has a beautiful appearance and impressive performance, making it a great choice for anyone in the market for a mechanical watch.

Looking for a stylish and functional timepiece? It must be the Steeldive SD1910S. Let's take a look at the numerous advantages this watch offers.

First, the Steeldive SD1910S diving watch is a very reliable watch.  It is made to survive both normal wear and tear and harsh circumstances, including deep-sea diving.  Anyone who appreciates water sports or activities will find the watch to be great because it is waterproof up to 1,000 meters.  The watch keeps its pristine state even after years of use thanks to its durable bronze casing and scratch-resistant sapphire crystal.

The Steeldive SD1910S is a timer that is incredibly accurate and durable.  It is driven by the precise and dependable Japanese NH35 self-winding mechanical movement.  The movement has a power reserve of roughly 41 hours, so even if the watch is not worn for a few days, it will still function properly.

Another aspect that consumers should consider is the vintage design of the Steeldive SD1910S.  The watch boasts an eye-catching green dial that gives it a bold appeal.  It is straightforward to read luminous time hands and markers even in low light.

The Steeldive SD1910S is also a versatile watch that can be worn for a variety of occasions.  Its classic design and high-quality construction make it ideal for formal occasions, while its waterproof and durable features make it perfect for outdoor activities such as hiking, swimming or diving.

For anyone who values quality, durability, and personality, the Steeldive SD1910S is a fantastic option.  It is a classic yet timeless investment watch thanks to its dependability, accuracy, and timeless design.  The Steeldive SD1910S is likely to wow, whether you're a collector or just searching for a fine watch to wear in any circumstance.

 Watches are one of the most important tools in our lives, and many people wear them while traveling. Mechanical watches are the most valuable types of watches. Mechanical watches, particularly mechanical watch movements, are more careful than quartz watches while using.

• Normal wear to avoid vibration

Only with an appropriate amount of activity can it continue to wind and run normally (the wearer may walk slowly when the activity is small, which is a normal phenomenon. Although the watch is shockproof, it is easy to break the tip of the balance shaft or the journal of the wheel train when the external impact is strong, and it can also cause the vibration of the fast and slow hands to affect the travel time. When using it for the first time, please rotate the crown 20-30 times to make the mainspring initially wound).

• Avoid magnetization

Although the watch is made of nonmagnetic materials that are not easily magnetized, the magnetic field, such as the magnetic buckle on the TV, next to the radio speaker, backpack, or purse, has a significant impact on the travel time.

• waterproof watch

Try not to wear the watch while swimming or washing clothes. When it rains or gets wet, do not pull out the crown to adjust the watch; instead, dry it immediately.

Sea water is even more impenetrable. Even if the watch is marked waterproof, it can only be guaranteed waterproof for one year because the waterproof ring of the watch will be tired after a year of wear and tear, as well as various unavoidable external factors such as sweat and dust, so the waterproof ring must be replaced after one year; otherwise, the waterproof function will be lost.

• watch cleaning

Generally speaking,3-5 years of oil washing is determined by the following factors:

 1.The watch's seal 

 2.The watch's wearing degree (wear degree) 

 3.A quartz watch can prolong the oil-washing cycle.

 4.Men's watches or pocket watches may be thinner, and the oil washing cycle for women's watches may be longer.

• Long-term storage of unused watches

The oil on the watch will deteriorate if it is not stored in a suitcase with mothballs or health balls, and the time will be inaccurate.It needs to be wound or worn to ensure flexible internal activities every month.

Hello everyone, and I wish a good day, and welcome to the steel diver watches shop. Let me share with you that the protagonist of our shop today is steeldive sd 1968. I hope that after reading my sharing, you can all become wristwatches collector weekly.

The price of this submarine watch is not expensive. The 22 mm watch bands are made of hollow silicone material with a 22mm silicone watch band. You can take a look at the color of the strap below, which is a must in summer.
Here is a brief introduction to its features and functions:
The MM300 is a slightly unusual watch because it is monoblock (without a case back) – meaning that the movement is encased from the dial side – ensuring great protection and the 300m water-resistance.
Watch Specification
Model: SD1968
Movement: Japan NH35 automatic, 41 hours of energy storage.
Case material: 316L stainless steel
Case back: 316L stainless steel
Bezel: 60 Click unidirect rotational ceramic bezel
Watch mirror: sapphire crystal with AR coating.
Water resistance: 300 m /30 ATM
Luminous: Swiss BGW9 blue super luminous.
Crown: Screw-Down
Case back: Monoblock Case
Watch Dimension
Case diameter: 44mm (without crown)
Case length: 50.7mm (lug to lug)
Case thickness: 17.2mm
Lug width: 20mm
Our service
Warranty: 2 years
Delivery: DHL
Returns policy: 30-day return and refund.
Style: automatic watch, dive watch, luxury watch
Package: watch, box, warranty card, user manual
The brand trademark is also very delicate, as shown in the picture:

After the upgraded version of simple mens watches, there are more wrist watch enthusiasts repurchased. This is one of the important members of our submariner watch shop. There are many others such as sd 1970 watch, steeldiver sd 1953, sd1975 steeldive, steeldive sd 1969, steeldive sd1962, steeldive sd1940, steeldiver sd1940 bronze and so on, these are all watches The leader of mechanical watches in the world, all men watches luxury watches in our shop are well deserved.

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Okay, share it all here today, and see you next time.