They stopped making coins for Cuba in 1960 8 years earlier. and the stopped making the centavo in 1958 10 years earlier. The one centavo only weighed 2.5 grams. The 5 centavo weighed 5 grams and was the same composition as the US 5 cent piece. They probably used the same planchets for both coins.
You just have a normal 5 cent piece within the normal weight tolerance range.