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| 1485 | A letter to the imperial council mentioned stamping items with the maker's mark. |
| 1529 | In the goldsmiths order of Gustav Vasa the maker's mark was mentioned. |
| 16thC | During this century the maker's mark appeared alongside the town mark. |
| 1689 | The imperial assayer A. Grill, in Stockholm, introduced date letters. |
| 1752 | The state took over the control of the purity of objects made of precious metals. |
| 1758 | The chamber assembly introduced the use of date letters throughout the country (including Finland) |
| 1860 | Instead of marks with the town emblem, special letters were introduced for the different places with assay office , corresponding with the first letter of the name of the town. |