In 1915 and 1916 Cuba issued several nice-looking gold coins in five denominations: 2, 4, 5, 10, and 20 pesos. These coins gain their value from the gold then contain.
To figure the melt value of these Cuban gold coins, multiply the current price of gold found at web sites such as kitco.com by the troy ounce weight of gold in each coin. Today, at the time of this writing, the price of gold is about $1200 US dollars per troy ounce, but tomorrow it will be different. Look it up.
Here are the troy ounce weights of gold in each denomination:
2 PESOS: 0.0967 troy ounces gold
4 PESOS: 0.1935
5 PESOS: 0.2419
10 PESOS: 0.4837
20 PESOS: 0.9675
If your particular coin is worn, has scratches, stains, cleanings, and similar damage the melt value is what the coin is worth. For instance, a worn 10 pesos today would be worth 0.4837 x 1200 = $580, plus or minus dealer fees and other minor amounts.
If you have a fully uncirculated example, there is a collector premium that is added to the melt value:
2 PESOS uncirculated: add $250 (approximately)
4 PESOS uncirculated: add $900
5 PESOS uncirculated: add $175
10 PESOS uncirculated: add $300
20 PESOS uncirculated: add $700