Not perforated; having no opening or aperture.

A stamp printed on sheets without any means of separation.

Refers to stamps without perforations or rouletting between the individual stamps in a pane. The earliest stamps were imperforate by design, but after about 1860 most stamps were perforated. Modern imperforates are usually errors or are produced specifically for sale to stamp collectors.

stamps without perforations. The earliest stamps were issued in imperforate form. Imperforate stamps that were intended to be perforated are errors.

Indicates stamps without perforations or separating holes. They usually are separated by scissors and collected in pairs.

Without perforations  Imperf-between Adjoining stamps without separating perforations  Imprimatur The first trial sheets of early stamps produced before a print run was authorised

Stamps printed and issued without perforations, deliberately or in error.

separated by a septum (nostrils)

A stamp sold without perforations or separating holes.

Stamps which have been printed without perforations between.

Stamps without perforations (i.e. the holes which separate stamps). The Penny Black is the best known example, these were cut by scissors, hence most imperforate stamps are difficult to obtain with nice even margins on all four sides.

Without perforations or other means for separating the stamps such as rouletting. The first stamps were imperforate and cut apart with scissors.