CV means catalog value. In most instances you can buy a stamp for much less than catalog value. It is not uncommon to be able to buy them for 25-50% of CV. Of course, that also means that selling a stamp for 25% of CV is a good deal, more likely get about 10%, unless it is a very high value stamp.
stamp collecting
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
Mainly 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
David Lidman has written: 'The world of stamps and stamp collecting' -- subject(s): Postage stamps, Stamp collecting
OG means Original Gum. This indicates the stamp has never been used and has been kept away from moisture so that the gum applied when the stamp was made is still intact.