Old Coin Worth a Decimal Pound and Five Pennies
Puzzle 5 of Jane Austen Hard Pack
Question is: Old Coin Worth a Decimal Pound and Five Pennies
and the answer is: GUINEA
Word Meaning:
GUINEA — (British, historical) A gold coin originally worth twenty shillings; later (from 1717 until the adoption of decimal currency) standardised at a value of twenty-one shillings.
Definitions from Wiktionary.