Simon Balthazar, also known as "J." Balthazar, is a local businessman and brother of the murdered artist, Jacob Balthazar. It is he who sells the genuine Arumbayan Idol to Samuel Goldbarr and relays this information about the whearabouts of the idol to Ramon Bada and Alonso Perez, and then Tintin. He had found the real Idol among his late brother's belongings and made copies of it, not knowing that the Idol had been stolen from a museum.

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