In my book, The Illustrated Encyclopedia of British Willow Ware, this pattern is certainly presented as one of the major variations of the willow pattern. From the early 19th century it was used more often on porcelain teawares whereas the Standard Willow pattern was a dinnerware pattern on an earthenware body. Bone china was invented early in the 19th century and was adopted by most factories in the U.K. during the 19th century. In the last quarter of the 19th century many of the potteries produced bone china tea wares and dinnerwares reviving Chinese Landscape patterns, due to the resurgence of interest in all things Oriental. Your pieces could date from c. 1880s into the early 20th century. The impressed number 1 doesn't give us any help regarding date or maker. Generally speaking, a tea cup is lower and wider than the coffee cup which tends to be can-shaped. It is a lovely set. Enjoy!
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