The Collaborative International Dictionary of English v.0.48:

Moneyage \Mon"ey*age\, n. [Cf. F. monnayage coinage.]
   1. A tax paid to the first two Norman kings of England to
      prevent them from debashing the coin. --Hume.
      [1913 Webster]

   2. Mintage; coinage. [Obs.]
      [1913 Webster]