Portmeirion
Portmeirion Pottery is a British pottery company founded in 1960 by Susan Williams-Ellis and her husband Euan Cooper-Willis, the company is based in Stoke-on-Trent, Staffordshire, England.
Portmeirion Homepage
Portmeirion Marks
1972 ~ 1981
Botanic Garden Plates
The company's most famous range is the "Botanic Garden" collection, featuring illustrations of various flowers and plants.
The "Circa 1818" mark seen on Portmeirion pottery doesn't refer to the date of the company's establishment.
Picture of the plates is from Portmeirion homepage.
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1982 ~ 1999
You can find an added ribbon with the words ‘dishwasher proof’, ‘oven to table', and ‘freezer and microwave safe’.
Dishwashers and microwave ovens were introduced earlier, their widespread adoption and popularity in households significantly increased from the 1980s onward.
1999 ~ 2000
2000 ~