Look for the pins holding on the wheels and small hook on the front of tower

(Tower Pictured is a Second Version)

Make sure the hinges on the plank that goes to the castle are not broken

Right: First Version Siege Tower

Left: Second Version Siege Tower (Note: Broken Pin in Wheel)

Right: First Version Siege Tower

Left: Second Version Siege Tower (Note: Broken Pin in Wheel)

First Version is a much darker brown stain over a ivory plastic. Second Version has a golden brown look.

Third Version towers are completely molded in orangish/brown plastic.