Hello to all from a total beginner. I am from Sofia, Bulgaria. I owe a small collection of mainly classical music and ballet autographs, which I inherited from my father, who used to work as a  music impresario.

The point is I have two Luis Alberto del Parana y Los Paraguayos 7" EPs, signed by Luis Alberto del Parana, a promo photo of the group, signed by him and a 1962 greeting card with handwritten greetings and dedication, sent from Turkey. You can see the photos below. 

Luis Alberto del Paraná (1926–1974) was a Paraguayan singer and guitarist. During the fifties, sixties and early seventies, he traveled extensively around the globe with his group Los Paraguayos, popularizing Paraguayan music. He is the best-selling Paraguayan musician ever. The man is an iconic figure amongst the fans of latin music.

The problem is I wasn't able to find online any signed by him item in order to obtain at least a vague idea of the value of his autograph. Could you please help me with the appraisal.

Many thanks in advance and sorry for my bad English :-)

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