Breakfast cups from the early 19th century are scarce. The extra large cup and saucer were special additions to tea sets, and were rarely available or ordered. This example from John & William Ridgway was made in bone china, about 1820.
Although both pieces are completely unmarked, this charming scene is Ridgway's pattern 2/928. You can see the pattern online at the great Ridgway Pattern Book website.
The saucer is about 6-1/2", and the cup's diameter about 4-1/4", height 2-5/8". Both pieces are in excellent condition. The cup rings like a bell. The saucer does not ring. There is an in-the-making kiln speck on the edge of the saucer which might explain this.
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