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Hi Guido,
Indeed Belgian, townmark city of
Namur ( Dutch=
Namen), Lion under crown and 75 under crown for 1775
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The maker's mark unclear/partly struck/faded away perhaps
A above
IB for: Joseph -Antoine Bodart, registered in Namur, his mark seen on ecclesiastical silver 1774-1791, couverts 1785
Peter.
Source;
Silver in Belgium 1500-1800 by Piet Baudouin. Pierre Colman. Dorsan Goethals. Belgische zilvermerken R. Stuyck