Clay's Fertilizer Seal, Image & Found by Jason Briggs,
Found at Claxton, Hartlepool, ?mm.
CLAY'S curved down / LONDON / FERTILIZER curved up // CLAY'S curved down / LONDON / FERTILIZER curved up
Clay's fertilizer appears to have been popular with gardeners in the late 19th and early 20th century as these old adverts show - Alamy and Graces Guide.