Hello Alex
I have one of these buttons as well and have always thought it to be a 'Court' button rather than a military one. The design does turn up from time to time but not as often as the standard 'Colonels' rank one.
It may just be a manufacturer's variation but I think this is unlikely as I see yours is by Pitt & Co whereas mine is by Jennens, so there were at least two manufacturers producing this design, unusual for a simple variation or error in design.
Hopefully someone else may have a little more information.
Roger
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