RAF(possibly) sweetheart

[Tigerlily]

I have bought a nice little homespun sweetheart shaped as the letter E with a tiny mm sized eagle on the corner. It looks very much like the RAF eagle but given the teeny tiny size of it, if RAF, what would it originally have been?

And on a not unrelated note, apart from Hobarts book on RAF badges & uniforms, is there a more comprehensive resource available? I desperately need a good reference book.
Many thanks
Alli