Found by Clive Bostock near Pickering, North Yorkshire.
Possibly manufactured by Robert Brown & Son, Ferguslie Fireclay Works and Caledonian Brick and Tile Works, Paisley.
This would be prior to 1902 as Robert Brown and Son became a limited company then and used ‘Ltd’ in their stamps thereafter.
Mansfield Brothers, Tileworks Manufactury, Church Gresley, may refer to South Derbyshire. They manufactured encaustic tiles.
Below – 25/03/1889 – Staffordshire Sentinel – Wanted and encaustic tile warehouseman. Reply stating particulars of previous experience, age and salary required to Mansfield Bros, Church Gresley, near Burton-on-Trent.
Information – The firm of Mansfield Brothers Limited, of Church Gresley, Derbyshire, was founded after a previous partnership of the brothers was dissolved by mutual consent on the 31st March 1924. Brothers Frederick George Mansfield, Thomas Cornelius Mansfield and Leslie Warner Rendall Mansfield, manufactured encaustic and tessellated tiles, sanitary ware, and fire bricks at their premises near Burton-on-Trent, England
(Note – SBH – It is possible that in the early days of the Mansfield Brothers Tileworks, they did not manufacture sanitary ware and thus it was manufactured by Robert Brown & Son. Later on, Mansfield Brothers appear to have manufactured their own sanitary ware).
.
Below – Sink brackets.