Hi Martin,
Mundus vult decipi, ergo decipiatur
Nice teapot with Dutch pseudo marks perhaps made by Alle de Haas.
Alle de Haas (1849-1923), founder father of Firm Alle de Haas in 1877, was a very talented master using the old silver techniques in combination with fantasy marks and later with pseudo/fake marks, because antique silver with the old guild marks sold far better than modern hand made silver in the traditional way.
See;
http://www.925-1000.com/forum/viewtopic ... do#p143087
http://www.925-1000.com/forum/viewtopic ... 90#p116738
Best,
Peter