Button backmark?

[JakePhelps]

Anyone have any info on this back mark?

*Fine Treble Gilt* *0285*

Any help would be appreciated

 

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[JakePhelps]

I have recently heard that this mark is only used by the CS Navy Is this true, if so i could have a cs navy button

 

[JakePhelps]

Unfortunately theres nothing on the front, just a regular flat button with a backmark