Rare WW1 Hand Sewn Flags of the Allies Excelsior Button

I cannot find another example of this type of button, I’m fairly sure it is a hand sewn one off, it features the flags of the allies sewn to a yellow silk background, the metal button is marked ‘excelsior’ on the back, the work is tight and skilful, it measures one inch in diameter and is in super condition.

Code: 27163