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First, what is the big three-pin small three-pin standard needle Three-pin small three-pin standard needle Three-pin: The watch above the main pointer has three, namely the hour hand, minute hand, second hand. If you want the hands to do the greatest convenience to read the watch, then you need to put the three hands in the center of the table position (non-circular dial is the centroid position). If the hour, minute, second hand are placed in the center of the circle, this dial design, called the third year. Small three-pin: the hour and minute hands set as a large needle, and in the dial to find a place to draw a separate second dial, and set a small stopwatch pointer (such as one of the sign of the Panerai torpedo small seconds), which The dial pointer design is called a small three-pin. Standard needle: minute hand to turn their own, hour hand second hand to set up a separate window. Third, the difference between the third and third small needle three needle The most obvious difference is that countdown. The third needle because every second can be displayed clearly, so at least it can read the standard 1 second reading, some tables can provide 1/4 to 1/10 second precision, and small seconds countdown is difficult to read To seconds, generally accurate to 5 seconds or so units. So a lot of stopwatch, chronograph part of the second hand or use the market to read. Mechanical watch was invented at the beginning, there is no coaxial design, but the three dials, hour hand, minute hand, second hand each a plate, respectively, the readings (which is the first specification of the needle). Later, in order to reduce the size of the mechanical watch, the idea of ​​placing the hour hand, the minute hand and the second hand on one axis was proposed. This is a demanding process for the current process, as the 2-pin coaxial requires the outer shaft to be a hollow shaft with a thinner shaft inside and a gap between the two shafts Because of the different speeds of the two axes. The needle of the watch is very thin, not more than 1-2 millimeters, making a uniform hole in such a small iron bar, one can imagine how hard it is. Therefore, to the hour and minute hands on a shaft, is already a great improvement, and then the second hand three-pin coaxial, mechanical pocket watch and the time was too demanding. Therefore, the old pocket watch, mostly small three-pin design, the second hand a small cap, minute hand, hour hand coaxial small three-pin design. Later, with the progress of science and technology, the mechanical watch became a watch from a pocket watch, requiring smaller and more accurate. With the maturity of the metal processing technology such as stamping and extension, the hollow shaft technology has become more and more mature. The hollow shaft within 1 mm Has become a reality, so the technical difficulties of the third needle table a break, the third needle table basically became the mainstream watch design. This is why the current mainstream three needle table, small three-pin table retro reason. The passage of time, in the mechanical watch more and more chase its ultimate modern, people also found the benefits of small three-pin table: that is, the movement can do more thinner. If the three-pin coaxial, then in addition to a shaft to have three different height needle track, you also need to have three different gear below the operating space, which for watch the thickness of the impact is enormous. If you move the second hand, then the watch movement can be 1-2 thinner thinner, which is now the limits of the movement, it is not easy. So in many ultra-thin watch designs, you will find most are using a small three-pin design, such as the Earl of the ultra-thin series and the Longines ultra-thin series. One of the benefits of a small three-pin is that it saves a great deal of energy. A total of three hands walking around the watch a total of three, the second hand is the longest, but also to go the most frequent, if the quality of the second hand to reduce, will effectively reduce the watch's energy consumption and enhance watch power reserve time.