Reusable envelope for correspondence - can be unfolded after first use reversed and folded so the unmarked surface is exposed

摘要

The envelope comprises a folded sheet with side flaps which can be folded on the reverse side. The front side is intended for postal markings. The flaps carry a self adhesive layer deposited over a maginal area. This allows reuse of the envelope after unsticking the flaps reversing the flap folds and re-assembling the envelope so that the reverse side of the sheet can receive new postal markings. The sheet has an open window in the franking zone permitting franking direct onto a litter contained in the envelope.