First flat button! Any help is appreciated

[antpich214]

Found my first button! Flat and on back says what seems to be London and best plated on the outside edge. I’m guessing silver plated? Any help with identification would be greatly appreciated

 

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[antpich214]

Found my first button! Flat and on back says what seems to be London and best plated on the outside edge. I’m guessing silver plated? Any help with identification would be greatly appreciated