Thanks to a mark on the St. Petersburg marks page, I've found out that the tea pot was made by Carl Adolf Seipel and assayed by Eduard Brandenburg in St. Petersburg in 1865. The tea pot weighs 700g:




The sugar bowl is older. It was assayed in 1840, but I can find information on neither the marker or assayer and the town mark is very hard to read. The bowl weighs 300g:





It would be most interesting if someone in this forum was able to share any information or insights on these makers/pieces, especially the sugar bowl.
Kind regards
Mikael