2NZEF - 20th Bn Officer's Cap Badge

[FZ1]

Hi and apologies for the "newbie" question!

I'd like to obtain an officer's cap badge from Capt Upham's unit, which I believe was the 20th (Canterbury-Otago?) Battalion.

However, I have no idea what a "real" one looks like or which dealer(s) may have one, so I'm looking for some pointers and/or examples of what to look for please ... and what to avoid!

Thanks in anticipation.

Jon