Does it not also depend if you use google.com instead of .nl you get different results?
If I search it I do not get that site on the first page and I use .nl

just set your meta good and make it ok for google

That is right. However, I'm a bit worried about the practical implications: if you want to attract more Dutch people into the coin, they might get confused. For example, when you see a sticker in a retailshop that mentions "Guldens accepted over here", I guess some people will try to pay with old Guldens - the old currency of the Netherlands before the Euro xD

As long there real silver ill buy them all =] As for the legal part, i would not consider removing the 'coin' part.

what abou that yes, is guldencoin ok? or change it to gulden?

The word "Gulden" is not a protected name, nor does this word is subject to ownership nor can it become.
The word "Gulden" is a general term, something like "police", "humans", "euro", etc.

Besides that, its also an adjective:
De gulden middenweg, een gulden tijd, gulden snede, gulden vlies, guldenboterbloem, etc.

So no unforseen juridical problems in any way 

@rijk

Just register

http://www.guldencoin.amsterdam and http://www.gulden.amsterdam

that will be smart

ware we got the money for hat?

Pre-mine.

So glad I bought 2, really like them alot, shiny and thick