Green’s Dictionary of Slang

nob n.3

also nobb
[ety. unknown]

[mid-18C–mid-19C] the game of prick-the-garter, a form of swindling game, in which one pricks a folded belt with a needle; the bettor attempts to pierce the place where the belt is folded.

In compounds

nob pitcher (n.)

[early 19C] (UK Und.) a specialist in prick-the-garter, usu. working at fairs, races and similar open-air events.