I have been pondering your teapot, hence the slow reply! Not early 20th Century, but probably early 19th Century? Staffordshire, well possibly not?
The Cambrian Pottery at Swansea, Wales made a Chinese Rose pattern and the reference that kicked off my thoughts is in The Pottery & Porcelain of Swansea & Nantgarw by E Morton Nance, wherein on page 151 section 4 he writes "A pattern in blue, consisting of a central medallion of a bunch of roses and an elaborate border of flowers in the style of the period, which is marked in transfer, "Chinese Rose" (Pl. CXCV. 3). The pattern itself he does not illustrate, but the backstamp he illustrates appears to be the same as the one on your teapot.
I have searched every resource I can think of and cannot find any image of Chinese Rose pattern by Cambrian Pottery and we have not seen a real pot in that pattern either.
I sought the views of Arleen and Grahame Tanner, who have researched the wares of the Cambrian pottery for many years and published two books recording virtually everything known about that pottery and their wares. They too have never seen a pot or image of the Chinese Flowers pattern, but agree that the backstamp in Nance and on your teapot appear to be the same.
Your teapot is known as London shape, produced by many potters, although the handle normally has an inner spur or kick towards the bottom. Your teapot is missing this feature and the handle goes straight down, which is recorded as a Cambrian handle style on such a teapot, EXCEPT the example I found has a different shape at the top where it joins the pot.
So I suggest a possible, tentative attribution for your teapot to the Cambrian Pottery. Is it rare? Well if it is Cambrian, we await hearing from everybody else out there with a pot in Chinese Rose by the Cambrian Pottery! Or can we hear of a better attribution?
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