When was The Pond of William Morris Works at Merton Abbey by Pocock painted?

Lexden Pocock lived from 1850 to 1919 and 'The Pond of William Morris Works at Merton Abbey' was painted from the time William Morris acquired Merton Abbey Mills in 1881, so that narrows it down to the 38 years inbetween 1881 and 1919. Sorry can't find a precise year