I fully share Franck's comment: great to see this brooch again!
As far as I know, this brooch had been seen on the Queen Mother only during the late WW2 years. Which means that this brooch has been remaining in the vaults for 70 years!
Here are larger pictures of this brooch:
- 18 May 1946, Windsor - Visit To Royal Farms with delegates attending the International Conference of Agricultural Producers (the last time the brooch was seen before its recent reapperance in New-Zealand?)
- 5 November 2015, Wellington and Dunedin, New-Zealand:
(Picture credit: Marty Melville/Reuters, via ParisMatch.com)