A mint stamp with original gum that has not been mounted or hinged.
The Stanley Gibbons catalogue reference used to identify and catalogue stamps.
The catalogue value quoted from Stanley Gibbons. It is not the same as the UPA auction estimate or a guaranteed selling price.
An overprint that changes or states the stamp’s face value.
A recognised difference from the normal stamp, such as a printing, overprint, perforation, watermark or design variation.