Recently, that old ring was found in the Naardermeer nature reserve.
The ring was affixed in Lekkerkerk; where then was a big great cormorant nesting colony. Great cormorants then did not nest yet in the Naardermeer. They did so for the first time in 1937, with just three nests. Now they are many more.
This old ring indicates that the Naardermeer colony was started by Lekkerkerk birds.