Orkney Pottery plate signed Tzū Chou.

Hi, good afternoon , and a happy new year to everyone.
Could someone please help with more information on this beautiful plate.
It is signed on the back. Tzū Chou. KTH.78.
Stamped ORKNEY POTTERY ROUSAY.
9.3/4" Dia.
Thank you.

A Rousay Heritage Walk by Christopher J. Harris, published in 1978, mentions The Orkney Pottery. I'm assuming Frank Harris is the potter or potter's son; he is mentioned elsewhere: "Made By Frank Harris of Lighthouse Pottery In Portpatrick, Dumfries & Galloway Scotland", KTH might be a family member. I suspect Tzu Chou was staying there on a summer pottery course   

"A Craft Pottery halfway between Rousay pier and Midhowe Broch producing a select range of handthrown Stoneware and PorceIain fired to a high temperature. A range of work is always on display in the showroom, where coffee and scones are available. Frank Harris, Banks, Rousay. (Rousay 266)"

Thank you.