Affixed to paper fragment mentioning "Empreinte Faible"
Before the overprint could be applied to stamps, it had to be applied to the sheet edge / the interpanneau to ensure that the overprint would look good on the stamps. This "test" had to be torn off and destroyed in accordance with regulations, but in rare cases it has been retained.
These are therefore very rare (per row of 10 stamps in the sheet, there was 1 proof)
- Geographic Origin
- Set / series
- Short Description
- Overprint Winged Wheel on sheet edge/interpanneau - Reference piece Balasse/VanKerckhoven
- Year of oldest stamps
- Name official catalogue
- OBP / COB
- MH (Mint hinged)
- Has certificate or expert signature