Gray dwarf hamster with white stripe, lost near Sundial Bridge

I lost my gray dwarf hamster, Niko, yesterday around 3pm. He's tiny, about 2 inches long, with soft gray fur and a distinctive white stripe from his nose over his head, plus a tiny pink nose and a faint white blaze on his left flank. I last saw him near the Sundial Bridge and the Turtle Bay area in downtown Redding, by Market Street and the levee behind the park. He's a cherished family pet with sentimental value—he was a gift from my sister last year.