I work at Knivesandtools.com, a webshop situated in the Netherlands.
Based on sales of American brands we sell Spyderco the most in the Netherlands, as well as in the rest of Europe.
It's the value for money thing that does the trick over here.
Other American knives that are in high demand are Microtech and MOD.
Various other brands like Chris Reeve, Cold Steel, Columbia River, SOG and Buck sell reasonable.
Strider is wanted by a select few, but difficult to obtain, same goes for William Henry.
From the European brands we sell very many Fallkniven, Forge de Laguiole, Opinel, and various kitchenknife brands like Zwilling Henckels and Wusthof.
These last two brands sell also especially well to our American based customers.