The best printed cards were produced by the photogravure process.
They are difficult to discern from real photos but usually don't have the glossy finish of photographs.
Postcards, as we are familiar with them today, have taken a considerable amount of time to develop.
First restricted by size, color, and other regulations, postcard production blossomed in the late 1800s and early 1900s.
Three-dimensional post cards also appeared in this era.
By the s, the standard size of cards had grown to 4 x 6 inches.
Multiples of lower value stamps were often used, as were stamps higher than the required amount.
The use of 'Picture Postcards' was first sanctioned by the British Postal Authorities on 1st September 1894.