FINSBURY PARK Rock Street -  Highbury Barn  -  Drayton Park  -  Barnesbury  -  Angel - Kings Cross - Euston - Tottenham Court Road - Oxford Circus - Marble Arch - Hyde Park Corner - Knightsbridge - Kensington - HAMMERSMITH BROADWAY  - Castelnau  -  BARNES POND ( Mon-Sat peaks )
Prior to this date had been numbered 173A, 173D and 173E

Taken from 1940 map drawn by Mike Harris
busmap.co.uk

29.10.35
Last day of operation, replaced by 73 and 111