Thank you for showing the design representation, Paul.
Page 7 of pattern book IX (1882) shows 2 sizes of a similar design – 1350 being larger than 1350½. The Kew image could relate to either pattern number (Sowerby usually used a fraction in their pattern numbers to designate a size or minor shape variation).
1350 is, I think, probably a sugar bowl, with 1350½ a posy vase.
The 1350 bowl also occurs with the sides pinched in so that the handles poke up over the top rim and the bowl becomes a basket.
I’ve seen the pattern in QPIW, white vitro-porcelain, purple malachite, clear, white opalescent and translucent grey-green glasses.
There was also a creamer to match the pattern 1350 sugar bowl.
Fred.