This one came by way of looking for Rd. 91432 - rather difficult to miss consecutive designs when they're on the same page - and would be silly to miss the opportunity of adding another Sowerby item to the list of Registered designs data base.
Will leave it to Fred to add the factory pattern No. - I have looked in Cottle, but after c. 1880 he provides very few of the corresponding factory pattern Nos., and others are far better than me at locating these things.
Unusually, the factory drawing appears not to comment or describe the nature of this piece - they do often - so assume some sort of dish or bowl - I see Cottle calls it a dish - and as usual not the remotest idea as to dimensions.
I did punch the No. into the Board's search, but nothing that I could find - so perhaps a scarce design - either that or I missed it.