Voidmstr sez, "I cut this clip from an old PD documentary I found on archive.org, a film made by the Los Angeles Fire Department in 1949. The announcer wants people to literally dial 1-1-6 to report a fire. A few days later it's now a footnote in a Wikipedia article about the history of emergency phone numbers.
Does anyone know anything about dialing 1-1-6 and whether I stumbled across something important?"
LAFD Video: Report Fire Promptly! Dial 1-1-6 Or Break the Glass
(Thanks, Voidmstr, via Submitterator!)