The strange curved head on top of “Tong” leads to DH#22.138.
You can read on your (brand new) reference book that the diameter is under 26mm and weight of 1.0 qian (= 3.73 grams), so yours is a way too light and the Numista sheet of DH#22.139 gives : Brass • 3.21 g • ⌀ 25 mm,
so DH#22.138 is probably not the correct reference …