1963 GB: Paris Postal Conference Postage Stamps | Unmounted Mint w/ Phosphor | Postal History

⭐ 1963 PARIS POSTAL CONFERENCE - Unmounted Mint with Phosphor bands GB Postage Stamps ⭐

This set features:

• 6d - Centenary of the 1863 Paris Postal Conference

📝 IMPORTANT STAMPY NOTES

1. Pre-decimal GB stamps cannot be used for postage.
2. This is the phosphor issue - phosphor bands were used as a security measure and to help sort mail. These bands are almost invisible to the naked eye but can be seen if you hold the stamps up to the light.