Ideal Theatre, 1912
Before heading back downtown, here's one more recently discovered gem in Northwest Portland. The Ideal Theatre was a neighborhood theater from its opening in 1912 until the late 1950s. It was a warehouse for 30 years before being remodeled into a photography and design studio in 1986.
I'd guess this sign dates from its earliest days. Check it out at NW 24th and Thurman.