Thank you for showing this piece, Roy – an uncommon item.
The lozenge for 10 March 1879 – Parcel 9 covers a bundle of 7 Sowerby design registrations – RDs 333167 to 333173.
Cottle (page 102) states that RD 333170 is for the pattern 1388 mustard and cover, and that RD 333171 is for the pattern 1393½ 2-handled basket (though it is not unknown for Cottle to be in error with collating some Sowerby RD numbers with the pattern numbers within some bundles) .
Between Jenny Thompson and Cottle, the other descriptions are:
RD 333167 as ‘plate and butter dish’
RD 333168 as ‘round sugar and cover’
RD 333169 as ‘round butter with two handles’
RD 333172 as ‘vase’
RD 333173 as ‘tea caddy’
so it looks as though the only design that may fit the description of Roy’s 3-handled ‘snail’ piece is the RD 333172 ‘vase’, though the definitive evidence would of course, would be the design representation (s).
Fred.