Green’s Dictionary of Slang

1. (also double finn, double finnif, double finnip, double finuf) a UK £10 note.

1839		H. Brandon Dict. of the Flash or Cant Lang. 163/1: Double Finnips – ten pound notes.
1857		J. Archbold Magistrate’s Assistant 444: Five-pound notes, finnips, ten-pound notes, double finnips.
c.1863		gloss. in Occurence Book of York River Lockup in Seal (1999) 37: Dear Dick, I have seen this swag chovey bloak who christened the yacks quick. I gave him a double finnip.
1864, 1867, 1870		Hotten Sl. Dict. 134: Double finuf, a ten-pound note.
1865		Leaves from Diary of Celebrated Burglar 25/2: I shall be the winner of a double ‘finnif,’ and have the ‘moll’ thrown in besides. [Ibid.] 94/1: With that he pulled out a ‘double finniff’ to pay for our refreshments. [Ibid.] 125/2: I’ll go up the-ir in a little wyle an’ buy a syde o’ baikun, an’ ‘sling’ t’ awd ‘bloke’ a dubble ‘fin’.
1879		‘Autobiog. of a Thief’ in Macmillan’s Mag. (London) XL 505: When we got into the rattler they showed me the pap; yes, there it was, fifty quids in double finns (£10 notes).
1882		Sydney Sl. Dict. 9/2: I pinched a swell of a fawney and fenced it for a double finnip and a cooter. My jomer stalled. I robbed a gentleman of a ring and sold it for a ten-pound note and a sovereign. My girl watched.
1895		Crowe Aus. Sl. Dict. 28: Finnuf, a five pound note; double finnufs, a ten-pound note; long-tailed finnufs, large notes.

2. (US) a $10 bill.

1949

Monteleone Criminal Sl. (rev. edn).

3. (US Und.) a ten-year jail sentence.

1949

Monteleone Criminal Sl. (rev. edn).