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PostBase One Franking System
Envelope specifications for sealing
Format
Thickness
Material
Sealing area
Flap shape and size
Subject to short-term modification.
Post card size to format ISO B4
Up to 7 mm
Envelopes must be suitable for sealing by machine.
The flap must be at the envelope's long side.
Sufficient closure can only achieved with continuous seal-
ing
area.
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