This knife was likely to have been marketed by the east London branch of the renowned Sheffield tool-making family, the Tyzacks.In 1839, Henry Tyzack (1809-1876), a saw maker, had moved from Sheffield to Shoreditch, London, where he opened a small shop. In 1860, Henry’s son, Samuel (1833-1903), leased a nearby property at Old Street. His edge tool works and retail shop employed five men in 1871 and eight men a decade later. Samuel died at Darenth Road, Stamford Hill, on 12 August 1903. He left £8,410.His so....