I found this in my Grandfathers collection. There is no date on the coin. It is about 1" square and silver in color. In the bag with the square coin is a very small round 1/10 guilder date 1963. I am having trouble finding info on these coins. Thaks!
From the Netherlands Antilles, off the coast of Venezuela. The 1/10th Gulden is .640 silver (0.0288 ASW) and lists for $3.50 in UNC. The 5 Cents might be KM 6. Made of copper-nickel and minted from 1957 to 1970. Fine runs a quarter, VF 50-75 cents, EF $1-2 and UNC $3-4.50.