89 is the year. The 1881 number, is the birds ID number. If it's a Pigeon band, the MC stands for the Homing Pigeon club the birds owner belonged to. If he didn't belong to a club, then the MC are usually the bird owners initials. Since you are from Wisconsin, you can research Pigeon clubs in your state, and look for one with the MC initials. The info will tell you what city the club is in, and may even give you the bird owners name. I have actually notified owners of some of the pigeon bands I have found, just to let them know that their bird was no longer around. I have never had an owner ask to send the band back to them. They just like to know, and thank me for taking the time to notify them. Good luck on your research.