A friend asked why the SH4131 movement is almost out of stock, while the VS customized 4131 movement has been delayed in launching. Because the development paths of the two movements are different.
VS customized 4131 movement is developed directly based on the original 4131 movement. Reasonable design and good stability. 95% of accessories are interchangeable with genuine movements.
The SH4131 movement is based on the 4130 movement manufactured with 7750 technology, and then modified from the 4130 movement. Only the appearance is similar, many parts inside the movement are pieced together using the technology of domestic low-end movements. What's more, the so-called standard that accessories can be interchanged with genuine movements is also exaggerated propaganda. You can review the previous disassembly and comparison publicity of SH4131 movement and genuine movements on the market.
In fact, the workmanship and finish of the SH4131 movement are roughly the same as the 2018 "blue hairspring" 3135 movement, but it is still relatively rough.
VS factory Daytona 4131 movement front milling details
When everyone plays replicas, they all want to buy a similar, good and stable one. But for the replica 4131 movement on the market, so far, the workmanship accuracy and milling treatment of the commonly used SH4131 movement on the market are the same as the stainless steel basin/stainless steel watch used at home. The milled texture is very shallow and not clear. Even from different angles, the texture is very low-end.
The difference in Rolex’s dense bottom design, the workmanship precision of the movement, and the appearance of the movement is usually invisible to everyone. However, the difference in movement processing level is essentially the difference in the strength of the movement manufacturing factory, the factory's processing equipment and technical personnel. If a factory can't even do simple milling, can we trust that this factory can produce high-precision, stable-quality movements? impossible. Just like many domestically produced cars, if there is no car company that can't even do the details of the body shell well, then almost no car company can do a good job in domestically produced engines. This level gap determines the level and quality of its products.
Polished details on the back of VS Factory Daytona 4131 movement
There are too few details, so if you are interested, you can read it yourself. It can be clearly seen that VS Custom 4131 has a genuine texture.
The processing technology of SH4131 currently on the market is relatively rough. Don't underestimate this gap. In the world of movements, small differences in accuracy mean huge losses in quality.
Seeing this, some people may ask whether any processing was done to make SH4131 so dark and rough. Don't worry about this. If you look at the comparison image below with other details, you'll see that the truth is pretty rough.
VS factory Daytona 4131 movement shock absorber structure comparison
Comparison of shock absorber structure of VS factory Daytona 4131 movement
Both the VS customized 4131 movement and the genuine 4131 movement are real shock absorbers, with the same appearance and structure and real functions. The SH4131 movement is equipped with fake shock-absorbing splints and domestic low-end movement shock absorbers.
Fake no card. Completely different from the genuine movement. More importantly, the stability and drop resistance of the movement will be much worse than the genuine ones and VS.
After removing the automatic rotor winding module, you can see the secondary main board of the movement. Here, the "little cleverness"/cutting corners of the SH4131 movement is here again! again! ! Again, replace the shock absorber that should be there with a regular ruby. Replace the shocks with gem pieces since the customer/you can't see them either.
The reason why the stability of these high-end Rolex movements is so great is that there are many amazing design details, such as the use of shock absorbers at key positions to avoid quality problems such as breakage. VS's new 4131 movement is invested in cost and installed with the same shock absorber as the original product.
The 4131 movement on the market is only equipped with an ordinary gemstone, and its appearance is completely different from the genuine one. The stability and drop resistance of the movement will be worse than many genuine ones and VS.
VS factory Daytona 4131 movement gem hole details
From the details of the gem hole, we once again examined the "little cleverness"/cut corners of this universal SH4131 movement. Where you can see, look for things that look the same, but where you can't, cut corners!
In the genuine 4131 movement, there are two rubies in the gem hole at this position to fix the transmission shaft. In the new VS 4131 movement, two rubies are also fixed in the gem hole at this position. In the SH4131 movement, there is only one visible ruby, which causes the transmission shaft to shake significantly, causing quality problems such as movement instability. Winding is light, but the gears are easily damaged, leading to quality problems such as no winding.
Structural comparison of escapement wheel of VS factory Daytona 4131 movement
In fact, many accessories of SH4131 are not developed according to the genuine movement, but are used together with the accessories of the 7750 movement. For example, this escape wheel detail. VS customized 4131 movement and genuine 4131 movement are both Rolex’s unique herringbone escapements. The SH4131 movement still uses the T-shaped escapement used in domestic movements such as 7750. The accessories also have many differences, such as the limit structure under the balance wheel, the shape of the horseshoe, etc.
VS factory Daytona 4131 limit structure comparison
VS customized 4131 movement and genuine 4131 movement, there are no two extra columns under the balance wheel. There are two more columns under the SH4131 balance wheel, and the structure is different from the original. The function of these two uprights is to limit the position of the horse wheel. This is a technology from the 1980s and 1990s. Today, high-end phones no longer use it, but low-end phones still use the technology.
VS factory Daytona 4131 movement time after disassembly and assembly
VS customized 4131 movement. After disassembly and assembly, the swing range can reach 300. After adjusting for the error, the running time was perfect. The genuine 3135 movement has been disassembled and reassembled without any adjustments, and the travel time data is still very good. Very cool.
The SH4131 movement was disassembled and assembled, proving that domestic movements, especially low-end machines, cannot withstand the curse of disassembly and assembly. After disassembly and assembly, the swing could not be raised, hovering around 200, and it was already half useless after disassembly and assembly. This is also the reason why many domestic movements of average quality have quality problems that cannot be repaired, cannot be repaired repeatedly, and become more damaged as they are repaired. (The processing precision of movement parts is not high enough, and the connection between parts is not tight enough)
SH4131 is limited by the production equipment and technology of the movement factory, as well as the "clever"/cut corners attitude in the details of the internal structure, accessories, etc., which destined it to have unstable quality, many problems, and a high repair rate. The only difference in quality is carrots. It does not change the quality of the movement, but only repeatedly selects those movements with good travel time data. This approach of individual factories is a bit of a cover-up for theft. It can only ensure that the time data is correct when shipped. After the customer receives it, whether it is stable or unstable depends only on the customer's character.
