Initial Issue (1931 to 1939) - stamped pottery marks: "Wedgwood", "Made in England", and alphanumeric lot sequence with two digit year
inked pottery marks: "Wedgwood Etruria England" and "Sole Importers; Jones, McDuffee, & Stratton, Co; Boston"

Pre WWII (1940 to 1941) - stamped pottery marks: "Wedgwood", and alphanumeric lot sequence with two digit year
inked pottery marks: "Wedgwood Etruria England" and "Sole Importers; Jones, McDuffee, & Stratton, Co; Boston"

Post WWII (1946 to 1950) - stamped pottery marks: "Wedgwood" and alphanumeric lot sequence with two digit year
inked pottery marks: "Wedgwood of Etruria & Barlaston Made in England" and "Sole Importers; Jones, McDuffee, & Stratton, Co; Boston"

Sesquicentennial (1951 to 1959) - stamped pottery mark: alphanumeric lot sequence with two digit year
inked pottery marks: "Wedgwood of Etruria & Barlaston Made in England" and "Sole Importers; Jones, McDuffee, & Stratton; Co, Boston"

Recent (1960 to present) - inked pottery mark: "Wedgwood of Etruria & Barlaston Made in England"
other marks: "Engraved by Wedgwood Studios", "Sesqui-Centennial", and "Association of Graduates"