Overprints are used for many purposes. They can be a precancel. They can change the value of a stamp if there is a shortage or rate change. They can be used to celebrate a special event. They are also used to validate the use of stamps from Another Country in the local country. The study of overprints adds a new dimension and understanding of history and time to philately.
stamp collecting
Do you mean as a picture to show the overprint? The best way is a combination of using a scanner and some photo editing software. The one thing that helps is that overprints are usually a single, solid color, which allows you to 'erase' all of the other colors, leaving the overprint.
Litho in stamp collecting refers to the printing process called offset lithography.
Kenneth F. Chapman has written: 'Good stamp collecting' -- subject(s): Collectors and collecting, Stamp collecting
Margaret I. Morris has written: 'Thematic stamp collecting' -- subject(s): Stamp collecting
Walter Young has written: 'Stamp collecting, A to Z' -- subject(s): Stamp collecting
Stamp collecting
because stamp were easily obtained .
Edward H. Spire has written: 'Adventures in stamp collecting' -- subject(s): Stamp collecting
James Watson has written: 'The Stanley Gibbons book of stamps and stamp collecting' -- subject(s): Postage stamps, Stamp collecting 'The Stanley Gibbons book of stampsand stamp collecting' -- subject(s): Collectors and collecting, Postage-stamps 'Your book of stamps' -- subject(s): Stamp collecting 'Modern 8mm cine-photography' -- subject(s): Amateurs' manuals, Cinematography
Mainly Stamp Collecting
David Lidman has written: 'The world of stamps and stamp collecting' -- subject(s): Postage stamps, Stamp collecting