Corinthian capital

Good, I moved my days to the house of my grandfather who was an extraordinary painter of his painting has one of the master Gabino Amaya Cacho looking in different house of emplos and pages related to the art I realized that its value round from about US $ 150 thousand to $ 500 thousand I would like to know who could help me and how can I make it arrive at an auction ... and excellent work is worth mentioning and sorry for the comment.