What's the value of a 1928 Model A AR/E28?

[Jayce]

My dad has a 1928 Model A AR/E28 which his dad rebuilt in the early-to-mid 90s. It has all of the unique parts on it in excellent condition.
I.E: Open front bumper, red steering wheel ect. It's all original, and has been garage kept all it's life.

(I don't plan on selling it, I actually plan on keeping it in the family for the rest of my life, just curious.)