An exciting new find.
Possibly Australian, sold by G.Herring. Very cute and dated from 1936:
19th September 1936.
The design with the 4 examples (in grey,cream and green) was called basketweave.
The yellow is very worn, but can be identified as the RAAF inspired fashion button seen also in grey and white. See http://www.ausbuttonhistory.com/?p=8009