The maker's mark N 10 with or without (+) under a crown for; J. Niekerk b.v. or Niekerk Groothandel in Gouden en Zilveren Werken, registered in Schoonhoven, this particular mark used 1970/v 1997 http://www.verwoerdceramics.com/silver Also see; viewtopic.php?t=41807
Wow. That's a terrible picture I posted. The Crown/N/10 is printed top down. Then the Hallmarks are: A lion facing right. It looks like II (roman numeral 2) under him A Minerva head with an M on it A weird sideways small u.
The initials KAN are down further and upside down compared to the hallmarks.