
1830–1834
W. Ridgway
W. Ridgway generally marks without '& Co' indicate a date 1830-34 however marks with the just the 'W R' initials appear to have continued until 1854
Pottery & porcelain · a closer look
The source notes later reissues: plural Ridgways indicates a later company and ENGLAND indicates use after 1891.
The source gives the 1870–1920 range for later plural-Ridgways reissues; that range is not established for this illustrated W R S & Co mark.

1830–1834
W. Ridgway generally marks without '& Co' indicate a date 1830-34 however marks with the just the 'W R' initials appear to have continued until 1854

1840
published by W. RIDGWAY, Son & Co HANLEY September 1, 1840 impressed mark

1879–1952
Ridgways W. R. England The inclusion of the name 'Ridgways' (in the plural) shows that the ware then it is from the later 1879-1952 period. Sometimes an impressed date mark will show when the ware was made.

1879–1952
W. R. England Ridgways The inclusion of the name 'Ridgways' (in the plural) shows that the ware then it is from the later 1879-1952 period. Sometimes an impressed date mark will show when the ware was made.


Undated
The source attributes these initials to Walker & Carter, which operated 1866–1889; this is not a mark-use range.