Trading cards and post cards that feature an actual photograph instead of a printed image are referred to as “Real photo card” or “Real Photo Postcard.”
One way that you can tell if a photo is vintage is from something called silvering. Silvering occurs on silver gelatin prints from the turn of the 20th century to as late as the 1950s. Most all black and white photos from this era are silver gelatin prints.
If you take a look at the image here, in the bottom left portion of the image, you can see a metallic sheen on the surface of the photo. That is silvering. Not all silver gelatin photos will have silvering, but if a photo has it, you can know that it is vintage.
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