SG 2069 - Greenwich Meridian and Clock (John Harrison's chronometer), 20p
SG 2070 - Industrial Worker and Blast Furnace (James Watt's discovery of steam power), 26p
SG 2071 - Early Photos of Leaves (Henry Fox-Talbot's photographic experiments), 43p
SG 2072 - Computer inside Human Head (Alan Turing's work on computers), 63p