How much do you think my horse is worth!

[Poppopbuckbuck]

I have a show Pony dark bay 14,2 DW x TB a real show stopper got through to pony UK and was recommended for showing as a veteran he is 16 years old this year and dose not look a day over 10. An amazing boy the judge at pony's UK mentioned he is a strong HOYs competitor as a veteran. He is a real mover dose dressage and jumps. He is out of HERCEROSE Samber Lines. I have to sell him and believe he is worth some money. Can any one help me with ideas of his worth... Thank you