Interesting item. My sister's father-in-law was an officer in the unit but wore the 1945 regulation Armoured Corps black beret with large rising sun badge and colour patch. Here is a link to one of two youtube items on the topic I made for him in 2011:
https://www.youtube.com/watch?v=IMUTjQAsvV0
He also served in the Korean War, seconded to 2RAR, and in Germany with the Royal Dragoons on attachment to the BAOR. He passed away last year aged 93.