Certainly looks like the badge of The Queen's Own Royal Glasgow Yeomanry, with a post 1953 crown. Became the Queen's Own Lowland Yeomanry from 1956 to 1969.
Thanks, the Yeomanry guided me to the right direction.
It's a Scottish Yeomanry 40L Button, NSN 8455-99-869-1706.
To my surprise I also found the other Sizes in the Box.
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