Green’s Dictionary of Slang

twig n.2

[twig v.2 (1)]

(UK Und.) a look.

[UK]Leaves from Diary of Celebrated Burglar 156/1: What have you got there, Yorky? let’s have a ‘twig.’.
[UK] ‘’Arry on the Road’ in Punch 9 Aug. 83/1: I often trots down to the Park for a twig when they muster.