Hi Amena,Not Antwerpen but Mechelen.
Back home and checked my library. The book Silver in Belgium 1500-1800 by Piet Baudouin, Pierre Colman & Dorsan Goethals
shows it is the town mark of Mechelen (Malines)
; the city coat of arms, a pale with a shield bearing an eagle, is in use from the end of the 15th century
The year letter for 1775; 75 crowned is as it should be for Mechelen 1775
The maker's mark could be a beaker/vase/flower pot and perhaps for Antoon de Raedt (1727-1818) . Waiting for confirmation by Diva.