This is one of the more peculiar vintage photos I've discovered on Pinterest. That place is like quicksand for a visual hoarder like myself. It has a wonderfully clean interface, simple but easy to use search, and the option to both link and upload images. When you search one image leads to another till you've killed hours.
I've set up my own boards, covering subjects from food to street art, and I have them for my books too. Being rather visual, I tend to look up pictorial references for all sorts of stuff as I write, even if thing is question only appears for a few lines. Like the steampunk wristwatch that plays minor role in Spirit Sanguine. In the old days I kept the images in folders on my desktop, later in folders within Scrivener. Now I put them on Pinterest too, keeping the board private till the book's release day.
I have no idea how many readers actually look at the images I've put up to illustrate my stories. The Dead in L.A. board has a photo of the lookout spot in Griffith Park where Jon and Leander have a conversation, and the Dead in the Desert one has pictures of the library in the desert where Leander make an important discovery. They are both real places, even if the characters and events are fictional.
Now excuse me, I have important "research" to do.