Question re 72nd Hampshire Yeomanry Badge

[Home Guard]

I am wanting to get a WW2 72nd Hampshire Yeomanry cap badge, which continued to be worn after they became an AA unit. I am confused as to what badge I am actually wanting because I have found them in multiple forms - all brass, all white metal, and several different versions in brass and white metal.

Which is correct? My copy of Doyle and Foster (top page 60) describes it as a brass badge, so wonder if that is what I should pursue? Although the picture is in color in this book it's hard to tell if it is all brass or mixed.

Thanks for any help here,

Terry