Yet another mystery line! It is possible these buttons were produced by either General Plastics or Beutron as they are coming up for sale in both Australia and New Zealand, and these companies produced buttons in both countries. Note also the spelling of ‘favourite’ as apposed to ‘favorite’. The cards are larger than the average 1950’s type (approx 8×10.5cm); perhaps they are from the late 40’s ?
And yet another different design card (from an ad from NZ):