www.925-1000.com

Dear Peter, thanks for your response - your explanation of the double mark makes sense. The boar is bolted onto the base. The base has a single swan mark and the boar body has the double mark. So, 2 parts of the whole. The head is removable and in fact has to be removed to reveal the double swan ...

I have this silver boar model.

http://www.ifranks.com/images/forum/boar/silver-boar.jpg

The base is marked with the French Swan Control Mark (small mark on the left) and two other marks I can't identify. I guess its a German model, early to mid 20th century with spurious old looking marks ...