Andy Pafko's License Plate?

An odd Andy Pafko auction sprung up on eBay recently for an autographed Illinois license plate from 1947. It's signed by Pafko in what looks like black magic marker. The description doesn't provide any information as to if this was Pafko's license plate or just an odd item that someone had Andy sign. Pafko did play for the Cubs from 1943 until 1950 so the timing is right but $50 for something odd like this is a bit much.