William Mammatt (1837-1914), a manufacturing silversmith, apparently started business in 1857.  His first partnership in Eyre Street / Arundel Street involved George Garlick.  It ended in 1864.  Mammatt next partnered John Harrop and George Albert Buxton, but this terminated in 1865.  Mammatt, Buxton & Co was the successor, which registered a silver mark from Arundel Plate Works, Eyre Street.  In 1867, that venture, too, had ended.   By 1871, Mammatt had launched Albion Plate Works in Holly Street, employing ten men and three boys.   This was liquidated in 1872.   William then managed Sheffield Nickel & Silver Plate Co (see Edward G. Draper), but this encountered difficulties.  In 1876, Mammatt registered his own silver mark at Albion Plate Works, Division Street, but this enterprise was liquidated in 1879.   Subsequently, Wm. Mammatt & Son appeared in Arundel Street (a silver mark was registered in 1885).   In 1894, W. Mammatt & Sons became ‘Ltd’, with £3,000 capital and William as managing director.  In 1897, it was bankrupt, though it remained listed at Portland Works in Randall Street (see R. F. Mosley) until a merger in 1901 with J. & J. Maxfield Ltd.  William Mammatt died, aged 77, at South Yorkshire Asylum, Wadsley, and was buried in Burngreave cemetery on 16 May 1914.  His son, George Mammatt (1863-1921), registered a silver mark in 1906 as an electro-plater in Jessop Street.  This firm had ceased trading by 1912.