Hi Blakstone,
It appears to be a full set of Dutch pseudo marks; D imitation year letter (57), 'glasses' imitation of a master's mark (445), the flower another imitation of master's mark( 411), unclear mark, and last M another imitation of year letter (224).
Those are clearly pseudo/imitation marks and not fake Dutch (hall) marks or marks to deceive. The teapot is most likely made in one of the northern Dutch provinces; Friesland /Groningen, around 1870-1930 and the silversmith family of Alle de Haas and Company, working in the city Sneek, registered 1877-1966 could be one of the possible candidates to be the maker.
Reference (57),(445), (411), (224): Valse Zilvermerken in Nederland K.A. Citroen ISBN 90-352-1058-1
Below another variation of those pseudo/imitation marks;
Oel.