Undated
R.P
Source captions mention Chester 1899, London 1938, Sheffield 1909 and Birmingham 1897 hallmarks.
Chester
Robert Pringle I established the business in 1835 after moving from Perth to London in 1820. It passed to Robert Pringle II, became Robert Pringle & Son in 1882 and Robert Pringle & Sons in 1899. It became Robert Pringle & Sons (London) Ltd in 1931 and later Robert Pringle (Engineers) Ltd circa 1965.