Brass implements bearing the stamp HJ were made by Thomas Hands and William Jenkins in Birmingham, England between 1791 and 1805. This stamp appears with some regularity on American furniture brasses and illustrates the practice of importing wares from England. For more on Hands and Jenkins, see Donald Fennimore, Metalwork in Early America: Copper and Its Alloys (Winterthur, Delaware, 1996), cat. no. 263.
A pair of knobs identical to the pair with the lady is illustrated in Wallace Nutting, Furniture Treasury (New York, 1928), pls. 3592-98.