Eska made 5 JD models of a pedal tractors in the 50's.
There was the model 60 and the 60 small. The 620. And 2 JD 730's.
Let's narrow down which one you have.
If it has a yellow stripe on the hood it would be the 620 or one of the 730.
In good condition they range in value from $400 to $700.
A picture would help.