This information is general. The silver from Denmark had an undefined origin. The trade knew that the F - for guardein Fabritius - represented fine silver. Not because the silversmits where exectional, but because there was a lot of silver from that period and the style/form was appresiated. Older silver had been reused modernized so there is not a lot of silver pre F.
The pre F was nice items but as style becare rococco empire Louis Seize ect the silver was reused in modern style.
In 1962 the first issue of Bøje was published. Including Year, month, lødighed, city, makers marks. But work continued.
In 1979 the blue book Copenhagen silver was published. In here you found every yearmark from 1608 until 1870 almost all year mark are there. With this you can date the silver. The marks was renewed every year. Style changed so even if year is not wisible - you can still see approx time. And because every of the 3 towers are unique, by the towers you can still date even if year is not visible. The book also contain month marks making it possible to date - not only year but also month. Very precise dating.
As lots of makesr mark is also included you could find maker. Lots of other information is also there.
In 1982 the green book - Sønderjylland and the red book provinsial silver was published. The 3 books include approx 50% of different marks. So still a lot to learn.
The books are sold out many years ago. Some work is done to make new editions - my guess is that this will never be published.
you can see that my copies are used a lot. But the info is there inside.
