Recent earthquakes in Japan
Japanese Calendar 
tagged calendrier, coins, collection, 硬貨, 西暦, numismate, numismatist, pièces de monnaie, 古銭学者 and 和暦
I have recently been contacted by a numismatist. He wanted to understand the date written on the coins that a friend brought him back from Japan. So here is an explanation that might help people with similar questions.
First, in Japan dates are usually written in 和暦 (WaReki) “the japanese calendar system” : 年号 (NenGô) “era” […]