This is a complete shot in the dark..... However, the mark has similarities to a Danish master Terchel Carstensen in Præstø 1826-1890, but????? He made spoons. Your strainer is not so far from a spoon ;-))). Difficult case when there are no more marks, or are there?
On the nail Elena! How did I manage to miss him???? Christensen was born i Skien 1773, master 7.10.1802, died 16.8.1852. Thomas acted also as alderman in the guild 1812-1817 and 1821-1837. His son Andreas C. overtook the workshop in 1841.