A virtually identical teapot, with the same castings, is marked with Thomas Hammersley's usual mark, TH in a rectangle. The teapot, now in the collection of the Winterthur Museum, also has an engraved band at the shoulder similar to the one on this example. (See Ian M. G. Quimby, American Silver at Winterthur, 1995 p. 243, no. 207.)
The present teapot bears the mark TH in a shaped rectangle, undoubtedly an unrecorded mark of the same maker.