The real photo postcards in this post do not have a common theme. They do have something in common, however. Masks were used to print the photos in various shapes against a plain white background. The photo printing masks were opaque sheets with openings of various shapes. They masked the border or background area of the print, allowing the image to be exposed only through the opening of the mask.
Sometimes the photo masks were sold in sets of various different shapes like those in the Manning's Masks ad. This ad appeared in a number of magazines in the early 1900s.
The next postcard is the only one other than the last oval one that has any identifying information on the back. It is labeled "Donald Partridge and Emmer."
Last, but not least, is a real photo postcard with an oval mask. Oval, circle, and rectangle masks were more common than the fancier shapes. This postcard appeared on my blog before here. It is a card I bought for the subject, not the shape. The others I bought mainly for the shape, not the subject.
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