Half-crown

[…] though we play but half-crowns, you know you may bet half guineas with him.

Keeping, therefore, an eye to the main chance, stimulated by the best possible motive, Helen emptied her purse on the bed, in such a manner, as to allow a stray half sovereign to escape, when she added the shillings and half-crowns to the little heap, and said, in a tremulous voice, "Here is my money."

Half-a-crown is known as an alderman, half a bull, half a tusheroon, and a madza caroon; whilst a crown piece, or five shillings, may be called either a bull, or a caroon, or a cartwheel, or a coachwheel, or a thick-un, or a tusheroon.

This is a masterly work of condensation, omitting nothing of importance and providing a most readable book that for a modest half-crown is incredibly good value.