| 21. | The Assay Office was then founded and hallmarked its first piece on 20 September 1773.
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| 22. | Seattle didn't have an assay office when the ton of gold arrived in 1897.
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| 23. | One impediment to Boulton's work was the lack of an assay office in Birmingham.
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| 24. | The book contains details of each assay office in the country, with their various marks.
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| 25. | Although most of his proposals were defeated, an assay office was established at San Francisco.
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| 26. | The assay office was purchased at a sheriff's sale by James Bailey in 1907.
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| 27. | A smaller rock alignment nearby was part of an assay office from the late 19th century.
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| 28. | They were made at the San Francisco Assay Office but bore no " S " mintmark .)
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| 29. | One of the 2 Dutch assay offices is located in Gouda between the Amsterdam and Rotterdam Airports.
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| 30. | James A . Baker III presided over the striking ceremony held at the San Francisco Assay Office.
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