High Chair/Rocking Chair

I have inherited a high chair/rocking chair from my Grandmother. It is oak with a cane back and seat. It has a crank mechanism to convert from a rocking chair to a high chair. I have seen several posts and auction sites with a wide variety of prices. Is it possible to get a good appraisal of what I can actually sell this chair for to an individual or to an antique store? The tray is missing the bolts that attach it to the chair. Also, the tray is faded, where the rest of the chair is in good condition. Would it be worth my while to try to repair and restain the tray? Or should I just leave it as is? Thank you.