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Keytype: A basic stamp design used for the issues of two or more postal authorities which include captions of respective countries, denominations etc. Earlier colonial issues of Britain , France , Spain , Germany and Portugal are keytypes.

Killer bars: Horizontal lines used for stamp cancellations.

Killer: A term used to describe particularly heavy obliterations

Kiloware: Collections made up of a variety of postally used stamps that are mounted on envelope corner paper. Kiloware is sometimes sold by the kilogram (about 2.2 pounds)