There is a mark that looks like a big T, not sure if it is a maker’s mark or not.
JOHN HARDY Sterling Silver Classic Woven Wheat Necklace 5mm Push Lock Clasp 18”
Iconic John Hardy sterling silver wheat chain necklace with integrated push lock clasp. Has JH hallmark and 925 on inside flat end of clasp. The chain is 18-1/2″ and it is 5mm wide.