Cloth Seal, GR, Image & Found by YorkyPete.
Found in North Yorkshire, 23mm diameter.
Two initials are stamped on one side. The first could be G or C and the second R, A or B ?
The other side is the rivet and only the central portion of the image remains. However it could well be a lamb with its neck turning suggesting the Lamb of God. There may be some connection with the Knights Templar but it is also used by others as the symbol of St. John.
From Wikipedia:- "In heraldry, a Lamb of God (or paschal lamb, or agnus Dei) is a lamb passant proper, with a halo or charged with a cross gules, and the dexter forelimb reflexed over a cross staff from which a pennon of St. George (Argent a cross gules) is flotant. The seals of the Masters of the Temple in England: of Aimery de St Maur, 1200, Robert of Sandford, 1241, Richard of Hastings, 1160–85, and William de la More, 1304, showed the agnus Dei."