This 1945 Wisconsin sticker was a registration/inspection sticker.
It has been perfectly reproduced from an original sticker issued by the state of Wisconsin during WW2 to show that the car was legally registered using the license plate from 1942 or even earlier as most states did not issue plates during the war years. The car had to pass inspection to obtain the sticker.
For an additional $10.00 we can add your license plate number to this sticker.