Green’s Dictionary of Slang

glanthem n.

money.

1789		G. Parker Life’s Painter 136: They begin now to drop the glanthem. I must tip ’em some rum gammon.
1833		‘Rowling Joey & Moll Blabbermums’ in Corinthian in Spedding & Watt (eds) Bawdy Songbooks (2011) IV 42: [as 1789].