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Dating Japanese coins

Started by shashivagale, March 21, 2015, 07:00:11 PM

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shashivagale

Dating 20th Century Japanese Coins
Japanese numbers:

Pre-1867 coins require more expert help than is given here.
List of emperors from 1867:   
Mutsuhito (Meiji), 1867-1912, years 1-45   
Yoshihito (Taisho), 1912-1926, years 1-15   
Hirohito (Showa), 1926-1989, years 1-64   
Akihito (Heisei), 1989- , years 1-   
Japanese coins are dated by ruling emperor (year of accession) plus the regnal year.
Prior to 1948 regnal numbers are read from right to left.
Examples:

Emperor   (Mutsuhito) regnal year   from R to L   = 2 x 10 + 6.
Date 1867 + 26 = 1893 AD.

Emperor   (Yoshihito) regnal year   from R to L   = 10 + 1.
Date 1912 + 11 = 1923 AD.
After 1948 (reform coinage) regnal numbers are read left to right.

Emperor   (Hirohito) regnal year (now L to R)   = 5 x 10 + 6 = 56.
Date 1926 + 56 = 1982 AD.
Since the 1960s fifty yen and higher denomination coins use western numbers for the regnal year.

Emperor   (Hirohito). Year = 1926 + 42 = 1968 AD.
The symbol   denotes the 1st year of the reign.

Emperor   (Akihito) 1st year of reign = 1989 AD.

Emperor   (Akihito) regnal year   = 10 + 7. Year = 1989 + 17 = 2006 AD.