If other parts aren't marked W&G perhaps it is a replacement rather than an original Peerless part.
W & G Du Cros Limited also well-known as W & G was a business established in 1901 as a motor importers and dealership by Harvey Du Cros, founder of the pneumatic tyre industry also founder and head of the Dunlop Rubber Company and a major investor in businesses connected to the automobile. It grew into a major taxicab business and car and commercial motor-body builder which manufactured it own brand lorries and passenger vehicles.
More information:-
https://en.wikipedia.org/wiki/W_%26_G_Du_Cros
Original early 1900's postcard of Acton Vale Du Cros Motor Works factory, W&G Works, overhauling cab chassis, photo by Campbell Gray, U.K. circa 1910