Thomas Southam & Castle Mineral Water. Thomas Southam traded from 1842 - 1934, but were known as Southams in the latter trading years. The Castle Mineral Water example to the left is the name of Thomas Southam's Mineral Water Works on the Wyle Cop and dates from 1905. In the middle is the '& Sons' example, again circa 1905. The far rarer '& Sons Ltd' example is shown to the right.It is a little later at 1910, and only three examples are known. All carry the Price/Bristol pottery mark.