Hi JanGroen, Johan Paul WILM is a famous manufacturer - the Prussian Hofjuwelier-and it was made in Berlin.The rooster is actually a bear with the letter K on its back. This is the Wardens mark. K stands for J.C.S.Kessner, 1819-1854. The secondary Assayers mark (Probiermeister) is the B=Ch.F.Deppe, ...