This 2-part set dates late 18th C or early 19th C. The pattern is also called "Chinoiserie Bridgeless" and "Bridgeless Willow". It bears one of John Davenport's earliest marks: an impressed anchor, and "Davenport" in lower case. This is Godden's mark 1181, which he says was used from 1795. It's also marked with an inscribed shape number: 20.
According to the Transferware Collectors Club data base, this pattern was introduced c. 1795-1805.
The set is about 11" long by 6-3/4" wide. It is in astonishingly excellent condition. There are no chips, no cracks, no crazing and no repairs. Each piece rings when tapped.
I have four covered segments of this set, which form the outer circle, but am missing the center piece, so have decided to offer these segments separately.