Large Anodised Crown

[dubaiguy]

Do any members have any thoughts on by who and where the large crown badge shown below would be worn.

For scale I've shown it next to what I believe are two 'civilian employee' crown badges - one on a Smith and Wright slider and the other being F&S on lugs.

Note that both the large crown badge and the smaller F&S civilian employee badge on lugs have 5 'stones' shaped like a quincunx between the large jewels. Perhaps indicating that the large badge in also of Firmin manufacture.
Mark