Royal Crown Derby Old Imari 1128 Trio - Teacup, Saucer and Side Plate 1973 RARE. Item has been on display previously, but shows little to no signs of wear as a result of this from what I can see, although please do feel free to check for yourself to make sure you are happy before purchasing!
After looking online at the date markings I believe this plate to have been made in 1973, based off of the 'XXXVI' marking on the back of each of the items.
Cup measures at about 6.5cm tall, and 8.5cm in diameter across the rim, the saucer measures at about 14.5cm in diameter, and the side plate at about 18cm in diameter.

Please study the pictures carefully to make sure you are satisfied before purchasing, and if you have any other questions, or need any other pictures, please feel free to ask and I'll try my best to help out! :)

Thanks for looking!