How can I tell an antique map or print from a later copy?

An antique print was made at or near the time of its creation using printmaking methods of that era, such as engraving, etching, woodcut, or lithography. A reproduction is a later copy, often made photographically or digitally, that imitates the original image.

There are clues to look for. Under magnification, many modern reproductions show a regular dot pattern from offset printing, while older printing methods leave lines and textures instead. Engravings and etchings often show a plate mark, a slight impression around the image. Paper also matters, since older papers have different textures and may show chain lines when held to light.

Some old prints were also restruck from original plates later, which falls between the two categories and affects value. Because the details can be subtle, a dealer or appraiser specializing in prints can help you identify what you have before you buy, sell, or frame it.