China 1920 Chu Yupu Silver Dollar Coin #YZ06

  

This coin has not been authenticated or graded by any professional grading service. Here is how I test each coin in the photos. Sigma Precious Metal Verifier Test. It checks the resistivity of the metals in the coin, I combine this with the specific gravity data (weight and dimensions) to determine what the coin is made out of.

Certain other metals are less dense than silver, usually about 6% less dense which effects the weight so if the coins are usually all the same size, I can tell via the weight if something is off with the alloys within the coin because it will weigh less than normal. After a lot of experince, I can say the usual diameter is around 39.8mm sometimes down to 39.2mm not the 39mm like most coin sites round the number down to, the center is usually 2.5mm and the rim is usually 2.6mm or 2.7mm.

A lower diameter and higher weight is a good thing because it shows that it is obviously silver. The coins are usually around 26.8 grams. I have seen a professional grading service be wrong in regards to certain coins being 26.4 grams and I have seen them grade heavier ones. I make sure it makes a sound to make sure there is not a tungsten core, but I do not rely on this test, I prefer specific gravity and the precious metal verifier to indicate the density of the metals and resistivity, for example copper is 6% less dense than silver so a silver plated copper coin with these dimensions, based on a specific gravity equation, would not weigh 26.8 grams typically, it would probably weigh 6% less. These coins were made in China so they are not going to sound exactly like an American silver dollar. Most people dont know this but a shorter ping means higher silver content. If it was attracted to magnets, it would get pulled right onto that magnet. Note : Silver is DIAMAGNETIC (look up diamagnetism) so the coin will slightly wobble a little bit if you put it on your fingertip and put a strong magnet near it and bob the magnet up and down really close to it, this does not mean it is made of steel or is fake, or is attracted to magnets, it is the coin being very slightly repelled away from the magnetic field.

Try it with a silver coin you already have. I put a very strong magnet 1mm away from every coin I test to show it is not magnetic and try to pick it up with the magnet. If you put acid on the coin or scratch it on a stone please do not return it because you will have ruined the numismatic value by doing that. Do your research on the alloys used at that mint during that time. Do that to your jewelry, not to rare coins.

If you do a return, expect to send the coin back in it's original condition or I will notice.