Watch List notes:

Advertising Token Johnson Matthey & Co. Refiners, Hatton Garden undated (c.1860-1890) 20mm diameter in aluminium, Obverse as Farthing 1860-1895 Toothed Border design, EF and lustrous. Cataloguers Note: made from the first electrolytic aluminium produced in England by the Hall-Heroult process. This reduced the cost of refining of aluminium considerably, and the first mass production plant opened in 1888. In it's pure state it had previously been considered a precious metal

Estimate: 10-20 GBP