The characteristics of the Gum used
NH stands for Never Hinged. The symbol or the letters also denotes that the stamp has no hinge applied to it and the gum is in a uniform condition without any marks.
H stands for Hinged and denotes that the gum has had a hinge applied to it.
LH stands for Lightly Hinged and denotes that the mark is small or minor after the gum has had a hinge applied to it.
This Heavily Hinged conspicuous marking is made after the gum has been hinged.
Hinge Remnant: As the name goes, a portion of applied hinge will remain attached to the stamp due to the difficulty in removing the hinge totally.
Disturbed Gum: This denotes that the applied gum has been damaged by some means of other than hinging. The reason for damage may be due to factors such as bubbling, glazing or even applied fingerprints over the gum.
No gum: This indicates that the stamp is unused and has no gum in it.
have seen are commonly used symbols and there are other symbols that
are used to denote or indicate other meanings. You may also come across
a word ?centering? and this concept further increases the stamp?s value.