Not a very good image to give up any clues, and to be honest it could have been taken any time after 1920 right up to the 1960's (if you see what I mean), but saying that, going by the clutch bag (if that is the right title for it), the hats, the overal style of the dress with its low waist belt/band and the hair style I would suggest that this was taken between 1925 and 1935 as a start period.
old rowley
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Claxton- East London & Essex Cuthbert- Mile End East London Edwards - East London & Essex Goll- Norfolk Harris-Mile End East London Hurr - Suffolk Law- Bethnal Green East London Moll- East London Robinson- Bethnal Green East London Tait- Argyll & Glasgow Thompson Shoreditch East london Watson- Glasgow Wood- Bethnal Green East London
Local history interest; Noak Hill & Harold Hill Essex