Gray tabby cat with white chest and red collar

I lost my gray tabby cat, Miso, yesterday around 6:30pm. He's medium-sized, about 9 pounds, with a white chest and a small heart-shaped white patch on his belly. He wears a red collar with a tiny silver bell, and there's a distinctive notch in his left ear and a slightly crooked tail. His eyes are different colors—green on the left and blue on the right—so he sticks out when he darts around. I last saw him near Riverfront Park, by the pedestrian bridge on Court Street in downtown Salem. He's a rescue who means a lot to me; if you've seen him, a message here or at [email protected] would mean the world to us.