This coin was cast in both bronze and iron and was based on the standard Chinese cash coin which was round with a square hole in the center. It was unearthed in the city of Kaiyuan (开原) in China's northeast province of Liaoning (辽宁省).
The bronze coins are much rarer than the iron ones and most of these coins have been found in China's northeast (Dongbei 东北) and in the northern part of the Korean peninsula.
Japanese coins are dated by ruling emperor (year of accession) plus the regnal year.
That information, along with the coin's country, is the minimum you'd need to look up the coin in a guide, check if it's in your collection, or trade with another collector.
The Chinese Numerals Japanese is one such language which doesn't use Arabic numerals (0, 1, 2...).
Examples: Emperor (Mutsuhito) regnal year from R to L = 2 x 10 6. Emperor (Yoshihito) regnal year from R to L = 10 1. After 1948 (reform coinage) regnal numbers are read left to right.
Emperor (Hirohito) regnal year (now L to R) = 5 x 10 6 = 56. Since the 1960s fifty yen and higher denomination coins use western numbers for the regnal year.
Japanese coins can be dated either in Japanese numerals or Arabic numerals.
If they’re dated with Arabic numerals, the Christian date is generally used, so the date doesn’t need to be deciphered.His company, 1715 Fleet - Queens Jewels, owns the rights to the wreckage.Bartlett was part of a three-man crew aboard Brisben' boat S/V Capitana when it found coins in shallow waters off Vero Beach, Florida.The coin has the same Chinese character inscription, 乾元重寶 (, were added to the reverse side of the coin to indicate that the coin was from Korea which is a country east of China.There is some controversy, however, concerning who actually produced the coin since no ancient Korean historical references mention it and the coin did not appear in any coin catalogues until 1938 when a Japanese coin catalogue (東亞錢志) attributed it as being Korean.Instead, Japanese uses combinations of numerals which add and/or multiply to the number being written.