Hi,
Images of the marks you described are required.
ETB could be for; Edward Thompson Bryant, London from 1889, known British Importer of Hanau (style) Dutch silver. For Hanau silver and maker’s marks see:
http://www.925-1000.com/Fgerman_hanau_marks_01.htmlFor Dutch maker’s marks see:
viewtopic.php?f=5&t=28590. Check out; BWE conjoined monogram in double oval for; B. W van Eldik & A.F. van der Scheer also known as Hollandia Zilversmeden, Zutphen mark used 1917/1950.
For more information about Dutch hallmarks see:
viewtopic.php?f=5&t=32028N.B. An image of the marks is required before a positive id can be given.
Oel.