Hi,
Drove me nuts:
What I thought to be a maker's mark in fact is another pseudo or fake maker's mark
VB; seen on cups, spoons, tea pots
# 357 Valse Zilvermerken in Nederland K. A. Citroen
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This sugar basket with cobalt blue liner could have been made in the Dutch province of Groningen and perhaps by the firm of the brothers Niekerk, registered in Groningen 1899-1927.
Peter