noun
Academic study of coins and currency, especially historical coins.
彼は古銭学の専門家で、江戸時代の貨幣に詳しい。
He is an expert in numismatics and is knowledgeable about Edo-period currency.
Compound of 古 (old) + 銭 (coin) + 学 (study). The alternate form 古泉学 uses 泉 (spring/fountain) as a classical term for money.