Silvering is when it appears as if the silver has come to surface of the image.
The address was to be written on the right side and the left side was for writing messages. The early images were ‘full bleed,’ meaning that they went all the way to the edge of the card.
Dating Real Photo Postcards In the United States real photo postcards originated in 1901.
The American design of postcards was regulated by United States law and can be dated in general by the text and designs.
Reprinted by Beijing's Three Shadows Art Center, his guides "Judging the Authenticity of Prints by the Masters" and "Judging the Authenticity of Photographs" were the first comprehensive books on the subjects published in China.
Around 1939, the color photochrome postcard appeared.* Early real photo postcards are on thinner stock have matte backs, though the fronts can be glossy.If the back has a smooth, plastic surface, it’s modern.I am indebted to Peter Stubbs for much of the information below (extracted from Peter's site and his permission for allowing me to use this on the Harberton website.