Trade card; etching. Thomas Barnett, 61 Great Tower Street, London. Optical, mathematical and philosophical instrument maker. To His Majesty's Hon.ble Boards of Customs and Excise.
n.d. 6.4 x 9.3 cm, conserved backed and edged to 10 x 13 cm. cartouche border incorporating dividers, rulers, set square. (Calv. 29) (C.C. 156)