Are Nickel Coin From France And The Netherlands And Such 100% Nickel?

If something is labeled as being 'nickel' it is most definitely of high purity

Agreed with the above comments vis-a-vis purity. As for your comment about the gold / silver standard, these coins generally replaced silver pieces of the same size / approximate weight in the 1960s, as currency devaluations paired with rising silver prices meant that the silver content began to exceed the face value of the coins.

Nickel was chosen for its durability, as well as the fact that it could be used to produce coins bearing similar specifications to their silver counterparts (an important aspect for the vending machine industry). The choice was not, on the other hand, made based on any consideration of intrinsic value (other than removing silver from coin), but there is a relationship.

I sold a decent bunch of these to a scrap dealer last week and to be sure they tested the metal - 98% nickel they said, enough for them to buy the lot as pure nickel. Don't know what the 2% impurity was about since they cut into the cores of the coins and tested that, I don't know their methods/instruments at all.

The melt value of a Dutch 1 Gulden nickel coin (1967-2001) is about $0.11.

Coin weight: 6 grams.
Current Ni price: $17.97/kg.