French, Champagne Seal, Louis Roederer, Image & Found by Andrew Peers.
Found in Leicestershire, 12mm.
Ligature possibly incorporating LBC // blank (nipple at the centre)
Champagne seal of Louis Roederer, founded as Dubois Père & Fils in Rhiems in 1776 - one of the last independent champagne houses, Louis Roederer, Wikipedia.