What is the value of a francisco franco caudillo de espana por la g de dios silver coin 1957- 5 ptas worth?

It depends. The coin (it is copper-nickel, not silver) is a 5 peseta coin from Spain, and was produced with the date "1957" between 1957 and 1975. The actual year (the last two digits, between "58" and "75") of production can be found written in tiny numbers in the star to the left of the eagle on the back of the coin. Value depends on condition and year, and can range from US 10 cents to US$175.00 (1958, 1963, 1961, 1966 and 1959, are, in order of decreasing value, the most valuable dates). If, instead of a star, there are the letters "BA", the coin is worth between US$100.00 in Very Fine (circulated) condition to up to US$300.00 in Brilliant Uncirculated condition.