This happens often with generic postcards.  Compare this card with our own entry 10120042 (from Maine) and you will see it is the same picture but the reverse caption just mentions a different state.  That toy tractor must have travelled very fast.  Anyway, we have three of these “Idaho Potato” cards available.  Two are unused and slightly stained on the reverse (Grades: 3, $0.50) and one was mailed in 1956 with stamp and partial postmark and water stain on the reverse (Grade: 3, $0.50).