It was listed by Roy Precious - Antiques & Fine Art. Sold pieces stay on Sellingantiques as a record of what has passed through, and the next one is rarely far away.
Roy Precious - Antiques & Fine Art has dated this piece to the 1920s.
Her dress is a simple low waisted shift, also the peak of fashion at this time.

She looks pensively into the distance, lost in thought, as if aware the the Roaring 20s were merely an interlude between one world war and another, with the despair of the Great Depression running from 1930 until the outbreak of war in 1939.

Siegfried (Stephen) Makepeace Wiens (1871-1956). Born in London in 1871 of German descent, he changed his name from Siegfried to Stephen. Studied at the Royal Academy Schools 1893-8, winning prizes.
His later years were spent in Worthing, Sussex where he died at the age of 85.

Six of his paintings are in the Worthing Museum and Art Gallery, and more in the Tate, London, and Brighton Art Gallery.
WIEN'S ADRESSES: 19 Honor Oak Road, Forest Hill, London SE 1, 1901 - 1916.
(Listed at other addresses as well between these dates.)

42 Addison Road, Hove, Brighton. 1928 - 1935.
Bergamo, The Glen, Worthing, Sussex. 1937 - 1945.
Exhibited at The Eighty-Fifth Autumn Exhibition at the Rooms of the Society, New Street (Royal Birmingham Society of Artists), 1911-1912.
Exhibited at The Exhibition of the Royal Academy of Arts (Summer Exhibition), 1893 - 1945.
(Exhibited 20 times, 23 works in all.)
Exhibited at Festival of Britain, London: 'Ten Decades, a Review of British Taste, 1851-1951'.
(Wien's 'Girl and Lizard' was lent by the Tate Gallery.)
SIZE: Canvas 40 x 30 inches.
PROVENANCE: Sussex Private Collection.
Roy Precious - Antiques & Fine Art has dated this piece to the 1920s.
Roy and nadine precious: specialists in portraiture from the 16th to the 20th century. Established in 1972.
You can view the stock and full dealer information on the Roy Precious - Antiques & Fine Art Profile Page