Harris Leon Brown (née Brun) was born in Warsaw, Poland, in 1843. The family was Jewish. His father, Baruch, was a government contractor. Harris was apprenticed with Moses Neufeld, a trader in Sheffield goods. Aged 17, he fled to Sheffield during the insurrection against Russia. After 1861, he traded as a jeweller, watchmaker, and diamond merchant in Gower Street, Burngreave. In 1872, he patented a cigar cutter with Samuel Elman. In 1876, he moved to Angel Street. In 1890, he registered a silver mark from Market....