Done some 'digging' on Ancestry.
1851 census shows Henry Watts, chemist at a shop next door to the White Hart public house on the corner of High St. & Rhode St.
Stayed there until sometime after 1871, because in 1881 he was still a chemist but along opposite the Empire Theatre at the other end of the High St.
He shows on the 1901 census as retired chemist.
So presumably your bottle is pre-1900
