The "sample coin" silver coin on the side is a sample coin that was trial-cast abroad at that time. It has English and Chinese characters engraved on the side. It is a huge collection. Very few people know about this kind of silver coin, and even fewer people know about it. Very few collectors have seen it, so even the collectors of machine-made coins who have written books know about it. Because they are rare, there are very few records. The reason is that such sample coins were made by people at that time. Handled by the minister in charge, the sample coins are only for the supreme ruler to review and approve, so they are very rare!