The Fancy Fox has dated this piece to the 18th Century.

The sauceboat measures 22.6cm (8 7/8") long, 17.8cm (7") wide and 9cm (3 1/2") high. The plate measures 24cm (9 1/2") wide and 2.8cm (1 1/8") high. The bowl measures 23.7cm (9 1/4") wide and 4.5cm (1 3/4") high.
There are a few small firing lines around the handles and some kiln dust spotting the the rims. The plate has been broken in half and been previously staple repaired but now professionally repaired, Handling wear is very light, just to one of two areas of the rim. The bowl has a small chip to the the rim and minor handling wear.

Provenance:
Previously offered at Bonhams Continental Ceramics & Glass, 24 May 2000, lot 130, and
Bonhams British & European Ceramics, Glass & Asian Art, 23 October 2013, lot 230
The sauceboat has a collection sticker for the Norwich Castle Museum

It is believed there are only 2 services of this design completed in 1788, one for the Spanish Ambassador to France, 7th Count de Fernán Núñez, Don Carlos José Gutierrez de los Ríos, and one for M. Halles, the latter service started in 1787 and completed early in 1788. Details of both services can be found in "Sevres Plates & Services Of The 18th Century Volume IV" by David Peters.
Other examples of this pattern decorated by this artist can be found in the Hermitage Museum, a plate, item ??-14429, dated 1789 and and ice cream cup, item ??-23935 dated 1788.
The Fancy Fox has dated this piece to the 18th Century.
Offering fine porcelain and pottery, 18th century and later, silver, glass and other small attractive pieces
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