moneyage

from The Century Dictionary.

• noun A mintage; the right of coining or minting money.
• noun A tribute formerly paid in England by tenants to their lord, in return for his undertaking not to debase the money which he had the right to coin. Also monetagium.

from the GNU version of the Collaborative International Dictionary of English.

• noun A tax paid to the first two Norman kings of England to prevent them from debashing the coin.
• noun obsolete Mintage; coinage.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun obsolete mintage; coinage
• noun obsolete A tax paid to the first two Norman kings of England to prevent them from debasing the coin.