Maker: Unknown (Ebay: Realm of Miniatures)
This image of a 1930s grill with a "day and night" motif is another frequently-used image
Maker: Diamond Match Co. Chico CA (Matchcover Collector: Taxi & Cabs)
Alaska's Digital Archives has a 1953 photo of a Union Cab sign with the same phone number. Oddly, the cab at right has only two doors.