Just a question...what types of cameras were used at the time to make a photographic postcard? It's rather smallish, just slightly larger than a 6x12 frame from 120 film. Any ideas? I found quite a few of them at an antique shop so I walked out with a couple handfuls of them, and a Russian postcard of Ilya Repin from 1969. ($7 spent...) Just curious about the cameras used...as the Russian postcard is a litho print.