Many thanks LDMJ. I began to wonder when I saw this photo of HM at the Chelsea Flower Show in 1955 -
When I searched for images of the wattle brooch the following two caught my eye as in many ways the details captured are similar to the 1960 photo. Of course it is easier to make out details in the colour photos. The original had me really perplexed.
The fact that HM wears this brooch in two different orientations also confuses me unless the photo is in colour.