Some non Telecom advanced grocery retailers still use these phones as intercom and paging phones....I can recall an Indianapolis area Marsh Supermarket I was recently in 2 months ago, in Fishers Indiana that was using these type of phones for their paging system. For Marsh being the first store to use the UPC code, they really haven't advanced their telecom in their stores since the 1970's, except for 1 store that has a Norstar system.
I also used to see these ring down intercoms at Dominick's and Jewel stores in Chicagoland....and as recently as 2 or 3 years ago they were being used with separate 1A2 key systems for the in store communications at Dominick's. Safeway finally upgraded Dominick's with BCM H323 IP systems to replace these.
Jewel and Osco used these up until the early 90's, and they actually had a branded Jewel symbol on some phones and others in the Osco section had an Osco logo. These were replaced around 1990 with Aiphone intercoms....and then the Big Whammy was in 1995, all of separate intercom systems were ripped out and equipped with new Norstar systems (now BCM) and intercom/paging/external trunks are all on one system. A good move in my book. As cool as those ring down phones looked, the sound quality from digital phone system paging systems and intercoms sounds much better over the stores speaker systems!