One series of each issue was made available to the UPU.
They distributed it, in this case to the Natal Postal Authority, who printed a Specimen overprint on it.
As opposed to the regular noted Specimen series.
- Geographic Origin
- Short Description
- Leopold II Fine beard - UPU series - Specimen UPU Natal - Unique series
- Year of oldest stamps
- Year of the youngest stamps
- Name official catalogue
- OBP / COB
- Catalogue Number
- MH (Mint hinged)
- Has certificate or expert signature