Peregrine Falcon, banded maybe?

Today, which happens to be my birthday, I came out of my office at lunchtime and noticed three Crows scolding a Peregrine Falcon which was perched in the Black Walnut tree directly above my office.  Against a  bright cloudy sky, it was difficult to photograph, but here is what I got.  In the bottom photo I think I might see a band on the left leg.  Do you think so?