This beautiful and functional teapot has been a puzzlement for me...I haven't identified the maker.
It is in excellent condition. There are no chips, no visible cracks, and no repairs. There is some mild crazing. The cover rings when tapped. The teapot does not ring.
This exact shape and pattern is shown on page 303, plate 1815, of "An Anthology of British Teapots" by Miller and Berthoud. They list it as "Unidentified". Theirs is unmarked. This one has the pattern number 692 hand painted on the base. Two companies making this style of teapot, at this time, with pattern numbers in the 600's are: Rockingham and Machin.
The teapot is 6-1/2" high.