File crease

File crease, file: postal item that has been kept folded over for a long period of time.
File proof: proofs taken from the finished master die to be kept in archival files of the printing firm.
Filet: (Fr.) frame line.
Filigrana: (Sp.

File Crease - Cover or other postal item that has obviously been kept folded over a long period.
Filler - A stiff piece of paper or cardboard found inside a First Day Cover. It provides necessary stiffness for a clearer cancellation.

See also: Packet, Pair, Catalog, Mounts, Arrow