Sentence:  The betting also began to shift. "Sixpence Ned wins!" cried three or four; "Sixpence he loses!" answered another; "Done!" and up went the halfpence. "Half-a-crown Joe loses!"—"Here you are," answered Joe, but he lost again. "I'll try you a '<!-- --><WSD>gen</WSD>'" (shilling) said a coster; "And a 'rouf yenap'" (fourpence), added the other. "Say a 'exes'" (sixpence).—"Done!" and the betting continued, till the ground was spotted with silver and halfpence. 
Meaning of the word marked with <WSD> tags:  A shilling.