I saw this antique brass three-unit mailbox with old-fashioned speaking tubes and doorbells in an apartment building that was built in 1904 in the Ukrainian Village in Chicago. I’m guessing it was installed either when the building was built or no later than the 1920s. Currently there is a modern six-unit mailbox (now it is a six-unit apartment building, before I guess it was only three) mounted in a different place, and modern doorbells at each door.