RAAF silver wings

[shinymetal]

picked these up at a flea market.. stamped STG.SIL
i can see on ebay similar ones are selling.. but i haven't being able to find a picture of one exactly the same as this one, with the blue enamel like that.
any australian airforce buffs in here? or anyone can point me in a direction?

 

[Spode]

That is a sweetheart broach sold by jeweler ls, the canteen etc. for wives and girlfriends. Not official issue hence the variations.