From what I can make out, the astrakhan beret and bullion badge were introduced in 1962.
The feather hackle was introduced in 1954, replacing the horsehair brush or plume being worn by the band and was also introduced for wear by officers (although not in the yet to be introduced astrakhan beret) in No. 1 Dress.
At some point the the band have adopted flat, inverted triangle shaped hackles as worn in the RTR OR's distinctively set up Dress berets.
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