Its functions: first, decoration; These lines and patterns can increase the beauty of silver coins. The second is protection; The existence of lines and patterns directly attracts people's attention, and prevents man-made bumps in the circulation process to the maximum extent. The third is anti-counterfeiting; The cutting technology and equipment of side teeth are national patents, and the mint and mold are not confidential and can be transferred, but the cutting technology and equipment are not transferable, which well prevents the private casting of silver coins. The fourth is theft prevention; Silver coins are made of precious metals, and scratching by criminals is the best way to steal them. With tiny side tooth lines, it can effectively prevent criminals from scratching.
Since the side teeth are so important, all countries with precious metal coins circulating in the market in the world have made a fuss about the side teeth of coins, and people also regard the side teeth of precious metal coins as an important basis for distinguishing authenticity.
So how to identify the authenticity of the silver dollar from the side teeth?
First, master the law:
Some people classify the types of side teeth of silver coins as more than ten, while others classify them as more than twenty. I also counted more than thirty kinds. In fact, even the same coin, due to the different factory order and foundry, there are differences in observing its side teeth with a magnifying glass. From this, I come to the conclusion that how many kinds of lateral teeth are meaningful to experts who specialize in silver coins, but meaningless to us ordinary silver coin lovers. If we want to stop buying counterfeit money, we must first make a breakthrough in mastering its laws. Its law is;
Jiangnan silver coin edge teeth; Except for the old Jiangnan Eagle Ze tooth, Kwai Mao coin thin tooth, Chen Jia coin straight tooth and Chen Jia (three points) big arc olive tooth, the rest are all medium-toothed big arc olives. That is, there is a tiny tooth between the two teeth.
Beiyangya; Whether the frame is wide or thin, it is shallow and irregular. The tooth of this coin is one of the unattractive teeth in all silver coins.
Big head and small teeth; Generally clean and tidy, without any carelessness, it looks better.
Clear teeth; Generally, olive teeth and straight teeth roll. However, according to social legend, there is a coin minted in Taiwan Province Province. If there is, pay attention to distinguish.
There are some teeth with three coins; It is one of the most beautiful carved teeth in all silver coins.
All kinds of human heads are commemorative coin teeth; For example, Yuan Shikai * * * and commemorative coins, flying dragon coins and so on. The teeth of these coins are beautiful and generous, and most collectors have never played with them themselves. So how can you tell the truth from the side teeth after seeing it? I urge those who are interested to study the Tianjin version of the nine-year fine-haired tooth. If you master the regular characteristics of this coin tooth, you will basically have the ability to identify the authenticity of the above coins.
Yunnan silver coin tooth; Most of them are olive teeth with rounded edges, but Yunnan big-headed teeth have been three years, and there is no special change.
Guizhou automobile coins and bamboo coins; Close to Tianjin for nine years.
Sichuan silver coin tooth; Straight teeth on the edge of universal rolling elements. When the silver dollar is flat, there are small thin edges on the top and bottom of the teeth, and most of the teeth of Sichuan coins are thin and dense.
After mastering these laws, it should be said that you already have the basic knowledge of understanding real money and counterfeit money.
Second, break through the key points:
This focus is on your own collection plan and collection goals, and what coins, varieties and versions you plan to collect. In these aspects, you should study repeatedly and focus on breakthroughs until you fully master them. Someone once asked me, first of all, I have my favorite coins, but I may not be able to buy them. I saw a favorite coin at the same time, but I didn't study it. What should I do? Secondly, some people say that I have bought it in the countryside for a long time, and I can't imagine what kind and version I will receive today. How can we make a breakthrough? The answer is yes;
Third, grasp the key:
What is the biggest key to lateral teeth? It directly reflects the density of silver coin metal molecules. Before stamping, the bubbles between metal molecules have been basically eliminated by rolling and stamping, thus strengthening the tight structure between metal molecules. Only after roughing and slicing can the bright silver dollar be stamped with a lathe with a pressure of 182~2 19 tons. After molding, the density of silver dollar, especially the side teeth, reached an extremely compact level. This solid foundation makes the side tooth profile become a strong line. The edge tooth pattern of counterfeit money will never reach such a strong level. So how to distinguish the authenticity from the strength of the side teeth of silver coins?
One is real money; No matter what shape the side teeth are, the first is high density and strict structure. Looking at it with a magnifying glass of 100 times, under the action of light, the tooth back reflects light, so the bright spots are small and concentrated, the tooth back and tooth slot are scratched by machinery, the tooth wall is firmly pushed, the tooth slot is shallow and shallow, and the tooth width is generally uneven. Except Beiyang teeth, most teeth are dates.
The second is to turn over sand coins; Observed with a magnifying glass of 1000 times, the metal molecules on the side teeth are loose and have sand holes, do not reflect light, the teeth are blocked, the tooth walls are weak, and some sand coins have small intermittent lines on the grooves and back, but these lines are formed by extrusion without any feeling of cutting.
Third, modern new high imitation mechanism currency; With a magnifying glass of 100 times, it can be seen that due to insufficient pressure, the tightness between metal molecules is poor, and the back of teeth has flocculent fluctuations, which also reflects light under the light of the magnifying glass. However, this light is astigmatism, the bright spot is large but not concentrated, the tooth wall has no strength, the width of the edge teeth is basically the same, and there are no cutting scratches.
Conclusion: Everything has its own rules. Only by grasping the root cause, looking at the essence through the phenomenon and taking this phenomenon as an introductory guide, can this be a reliable scientific method. To sum up, knowledge begins with practice, and only by raising perceptual knowledge to a rational level can we make a leap in the process of distinguishing truth from falsehood.