Qrt.S wrote:I have an answer but it is a bit vague. Take a closer look at the marks and you will find that they are over marked with other marks. Don't ask me why. Look at the cartuoche with the L mark. Is it rectangular or round e.g. Lidköping or Linköping in Sweden? The maker's mark is also difficult read, is it AEN, ABN or what.That makes it difficult indeed to say something about the maker. Before this discussion continues I would appreciate if you show me a picture of this St:Erik's mark you mentioned in your original question. That might give us a better clue. The 0's meaning is unclear. It could so called journeyman's mark or type mark or? Sorry.
Hi, dear Qrt.S!
Unfortunately I will not be able to give more detailed information that in the first post.
My item bears 5 marks:
1. AEN — the silversmith’s mark
2. Three crowns
3. the head of Saint Eric
4. Е7 - dating cod
I am sure that third mark is the head of Saint Eric, as I have one more item with marks like on the aforementioned kettle:

To the point, there is additional unknown marks «J» too...