C15-859. Probably in use at some time up to 1915. Print. All black. 23.5x6mm
 This backstamp has been seen on pattern 709, on two examples of pattern 859 (a version of Sèvres Marbling) and on another early, unnumbered pattern. The lettering style appears unique in the context of all other Gray's Pottery marks although the 'o' enveloped by 'C' for 'Company' exists in B3 First Galleon backstamps and in the Gray's exhibition stand lettering in 1919.