Juliana ruled the Netherlands from 1948 to 1980. Coins minted in 1, 5, 10, and 25 cent denominations are made of non-precious metal and are not worth more than a few US dollars. One and five cents are minted in bronze, ten and twenty five cents are minted in nickel. There are different patterns on the reverse site (see secondary picture). Circulated coins like the ones in our pictures are worth less than $1. If you can find a completely uncirculated specimen, a collector might pay you a few dollars to add it to his or her collection.
Coins dated 1960 and earlier are becoming less and less common in fully uncirculated condition where they catalog for about $10. Coins dated 1957 and earlier that are fully uncirculated catalog for $15.
These are inflated catalog values - be sure to read the 'Important Terminology' page on the top left to translate the values into actual buy-and-sell prices.
Coins like these are what I like to call 'borderline modern coins'. There is a lot of definitions of what a 'modern coin' is. Sometimes, the line is drawn at 1964, when a number of countries switched from silver coins to non-precious coins. Other times, the line is drawn at another arbitrary year, like 1940, 1955, or '65 years before this year'.
Coins that are borderline modern can be tough to give a future-proof appraisal of because, as more and more people begin to consider them as 'non-modern', demand for them can rise.
Sometimes this produces a brief, artificial spike in value, as speculators temporarily deplete the markets. But if collectors aren't as interested in the coins as the speculators predicted, the market will re-adjust itself, and values will fall back down to a level that will probably not be much higher than it was before the spike.