Aramis Antiques has dated this piece to the 1900s.
The original mount is inscribed - On The Ouse, Near Hemmingford, Hunts. George Oyston.

The watercolour, which was unframed, appears not to be signed but the scene, river and especially the rushes protruding from the water are typical of Oyston’s hand.
The watercolour has been reframed but the mount and painting are original.
Image dimensions 14cm H x 19.5cmW
Aramis Antiques has dated this piece to the 1900s.
You can view the stock and full dealer information on the Aramis Antiques Profile Page