This is not a design that I recognise as being from Sowerby (but I open to persuasion of its Sowerby origins with appropriate evidence). .
It does have some similarities to the Sowerby pattern no. 1267 basket (shown on page 5 of their pattern book IX of 1882), which is from their RD 316491 of 20 November 1877 – Parcel 4. The vertical ribbing on the Sowerby basket sides is, however, completely plain, the base is also decorated with parallel ribs, and so is the handle.
I have seen them in vitro-porcelain and malachite glass (see the photos), always with the Sowerby peacock trademark and the registry date lozenge, but never in clear or transparent coloured glass.
Fred.