Stockholm has a wide range of anchor plates — of all shapes and sizes, spanning back at least to the seventeenth century.
My favorite is the one that looks like an owl:
A collage of the various kinds of plates that can be found in Stockholm:
![](https://4.bp.blogspot.com/-0Q7P7w4OMdk/Vdy3vyJCHoI/AAAAAAAAJZ8/Giek_kQngyY/s400/A1.jpg)
I found several examples were the anchor plates were also used to date the buildings. The oldest is from 1630!