A single word on the bottom of a plate can narrow its manufacture date to a specific multi-decade window, thanks to a piece of 19th-century American trade law that most collectors rely on without ever having heard its name: the McKinley Tariff Act.
The McKinley Tariff Act of 1890
The McKinley Tariff Act, effective March 1, 1891, required that imported goods entering the United States be marked with their country of origin — before this law took effect, imports faced no such requirement at all, which means the presence or absence of country wording is itself a genuine dating clue.
No Country Mark: Likely Pre-1891
A piece with no country-of-origin wording at all was most likely made before the 1891 requirement took effect — though it’s worth noting this isn’t airtight, since a piece made for domestic use rather than export to the US, or a piece that simply predates any systematic marking convention entirely, can also lack country wording regardless of age.
Country Name Alone: 1891 to 1921
A piece marked simply with a country name — “England,” “Germany,” “France” — without the word “Made” dates to the window between 1891 and 1921, since the original 1891 requirement only mandated the country name itself, not the specific phrase “Made in.”
‘Made in [Country]’: Post-1921
In 1921, the requirement tightened to specifically require the phrase “Made in” before the country name, written in English and legibly understandable to American buyers — a piece marked “Made in England” or “Made in Japan” reliably dates to 1921 or later.
A Precise Example: Nippon to Japan
Japanese porcelain provides an especially clean illustration of this system, since the mark changed from “Nippon” to “Japan” specifically at the 1921 cutoff; see our Nippon marks guide for how this creates one of the most precise dating windows in the entire hobby.
The ‘Foreign’ Mark Caveat
Some pieces are marked simply “Foreign” rather than a specific country name, and it’s worth being honest that this marking doesn’t reliably pin down either age or origin on its own — the practice varied enough across different manufacturers and different decades that a “Foreign” mark alone is a weaker dating clue than a specific country name, and deserves real research before drawing firm conclusions from it.
This Is a Supporting Clue, Not a Complete Answer
Country-of-origin wording narrows down a broad date range reliably, but it doesn’t identify the specific maker, pattern, or exact year on its own; see our reading backstamps guide for how to combine this dating clue with the rest of a mark’s information.
Why This Tool Is So Widely Trusted
Because the McKinley Tariff Act and its 1921 amendment were federal law rather than a single company’s internal practice, this dating framework applies consistently across essentially every maker and country exporting pottery to the American market, which is exactly what makes it such a reliable starting point compared to maker-specific mark research.
A Practical Example
A plate marked simply “England” with no other maker identification still tells you something genuinely useful — it was made between 1891 and 1921, giving a thirty-year window to work with even before any further research into the specific maker or pattern.
Applying This Across an Entire Collection
For a large inherited collection with mixed pieces from different makers and eras, sorting by country wording first gives a quick, rough chronological organization before diving into more detailed maker-by-maker research, making a large or confusing collection feel considerably more manageable from the very first pass.
Regional Wording Variations Worth Knowing
Some countries used slightly different wording conventions or transitioned through intermediate phrasing before settling on the standard “Made in” format, so treating this framework as a strong general guide rather than an absolutely rigid rule leaves room for the genuine minor variations that show up across different exporting countries and individual manufacturers.
Treating this as a strong starting hypothesis rather than an absolute rule keeps you appropriately open to genuine exceptions.
The framework holds up remarkably well across the vast majority of pieces you’ll actually encounter.
