These are the official imperforated stamps issued by Bpost and all with back number (modern issues) and without back numbers for older issues.
The scans provide the best impression.
The first photo shows an overview, the following the details.
- Geographic Origin
- Short Description
- Group of imperforate official and surcharge postage due stamps
- Year of oldest stamps
- Year of the youngest stamps
- Name official catalogue
- OBP / COB
- MNH (Mint never hinged)
- Has certificate or expert signature