The cup stands 2 7/8 inches tall, measures 3 inches across the top, and weighs 8 1/2 ounces.
The bottom is marked: WEDGWOOD (R) of Etruria & Barlaston - Made in England - Copyright Frederick Warne & Co. - Beatrix Potter Designs TM - PETER RABBIT TM. There is a small number 51 next to the other marks.
The cup is in very good, pre-owned condition, with no chips, cracks, or crazing. There is a hint of discoloration to the bottom rim (see last photo). The cup would display well.
Please see all the photos.
Thanks for looking!