Rare academic term for the study of coins and currency. The more common term is 古銭学 (こせんがく).
See also: 古銭学
He is an expert in numismatics and is knowledgeable about ancient coins.
Compound of 銭貨 (せんか, 'coin') + 学 (がく, 'study'). The exact historical origin is uncertain, but it follows the pattern of academic discipline names.