Silver jewelry - flea market find

I went to a flea market last weekend en these are my finds.

Left, a filigrain brooch, marked 800.
4 silver rings (all my size). The one with the cabuchon stones on the left is very interesting.
It's marked with the dutch sword and with a makers mark. The makers mark is Symbols. I can find only one
ring from the same maker in an auction from Catawiki.

Paid only € 5,50 for all.