Not much I'm afraid. 1967 the coins were already being made in cu-ni (copper-nickel) and in the late 1960s 100 Gulden were worth about $10. Copper-nickel coins last a long time and for this reason, you could find coins from most European countries minted in the 1960s still being used right up to the time of the changeover to the Euro. (The exception being France who made completely new currency to reflect their removing two zeroes from the old coins and notes etc. So 200 old French francs became 2 new francs).
Dutch Guilders (specifically 1, 2 1/2 Guilders) were minted in .720 (72%) silver prior to 1967. You can get the value of silver for this coin and a bit more if its in Mint condition (grades AU or higher). Although as a minimum 3 dollars as silver melt.
€ 1,14
$200 000
There was no 1960 British 5 coin set issued.
There is no such thing as a 1960 silver dollar coin.
How much is a 1940 2 1/2 gulden netherlands coin worth
Such a coin does not exist. There were no New Zealand 1960 Halfcrowns minted.
25 cents
The value is approximately 235£ or 375$
Please post a new and separate question with the coin's denomination.
7-18-11>>> 1960 & 1960-D Franklin half dollars are not rare or even scarce, if the coin has any wear at all value is just for the silver about $14.00.
worth millions of dollars
Such a coin does not exist. The last British Farthing was minted in 1956 and they were demonetised in 1960.