Definitives.org

Glossary of philatelical terms

WANT LIST

Common way of exchanging stamps: a listing of stamps that are needed by a collector given to another stamp collector.

WATERMARK

An image intentionally impressed into the still-wet paper during paper manifacture process. Its purpose is to decrease the issue of fake stamps.

WATERMARK TRAY

Black plastic tray used to discover watermarks on stamps. The black colour helps to see the watermark on white back side of the stamp.

WMK

Abbreviation for watermark.

WOOD (LAMP)

Special glass that produce ultraviolet light: it is used to detect stamps fluorescence.

WW I

Abbreviation for World War I

WW II

Abbreviation for World War II

WZ

Abbreviation for Wasserzeichen (watermark in German).