Green’s Dictionary of Slang

leather-lane adj.

[the Leather Lane market off Holborn, London]

second-rate, poorly made.

[Aus]Vaux Vocab. of the Flash Lang. in McLachlan (1964) 250: leather-lane any thing paltry, or of a bad quality, is called a Leather-lane concern.
[UK]Egan Grose’s Classical Dict. of the Vulgar Tongue.