The graphic is from a 1938 grocery store ad in a newspaper (Leon, Iowa). How about the phone number, 7?
That would be wild to have a single digit phone number. Back then they no doubt had to have the switchboard person connect them, like on "Andy Griffith." Otherwise anytime someone started dialing a number that started with 7 your phone would ring.
Wonder who got 1? That'd be something. The day you got the phone number 1 there was no one to call, at least in that town.
It was probably a disruption for them when the phone numbers got lengthened. They'd be thinking, We've been 7 all these years! Why can't we keep it!
Here is someone who had their phone number as "1". The newspaper, The Spirit Lake Beacon, Spirit Lake, Iowa, in 1933.