✅ SOLVED What is this button please?

[labelstone]

I have another unidentified button. The front looks like a fleur de lis.
On the back it says:
Extra treble gilt ...Stand d.
Thanks so much for any assistance.

 

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[farmdump]

I am not a button expert but I think your button was probably made around 1900.

 

[TheCannonballGuy]

That is the emblem of Britain's Prince Of Wales. Your button's backmark was a typical one on 2-piece British-made buttons from the 1830s through the 1860s (and perhaps somewhat later). On your button, the three feathers are shown inside what is called a "Ducal Coronet."

 

[labelstone]

Thank you so much!