MINT, no gum, 2 highest values in set of 9, 1921 Rila Monastery, death of James D. Bourchier, Balkan correspondent of the London Times
VF
0.40 ...
Neuf sans gomme: (Fr.) no gum, the stamp has no sign of gum.
Neu-Groschen: (Ger.) currency unit in Saxony.
Neuheiten: (Ger.) new issues
Neu-Kreuzer: currency unit in Austria, Bosnia and Herzegovina.
No Gum (NG). This is a mint stamp that for whatever reason has no gum on the back and it should.
Tears. Stamps that have tears (torn corner or small tear at top or bottom).
Blind Perf.
Mint no gum (MNG) - the stamp appears to be unused but has no gum. It might have been used but not cancelled, or have been issued without gum.
Unmounted mint (UM) - the stamp is unused and has never been mounted.
The Scott catalogs also values some older stamps of which few examples exist with original gum in "unused, no gum" condition.
gum In early issue, part of gum or no gum; later issues, complete undisturbed gum; no faults except hinging
colour Fresh and bright, no fading
paper Free of all defects ...
Gum Skip - a generally small area on a stamp to which no gum adhered during production. Gum skips are most commonly encountered on flat plate stamps from the first part of the 20th century.
In both cases, this type of cleaning is acceptable, because it does not damage or alter a stamp in any negative way; however, peroxide should be used only on stamps with no gum, because it will remove the gum from mint stamps.
 See also: Used, Stamp, Cover, Perforation, Cancel
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