Without perforation Imperforate stamps are usually separated with scissors or a knife
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
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 in sheets without perforation or other means of separation Imperf Between - Normal stamps that are perforated but with a line of perforations omitted between adjoining stamps or rows of stamps due to faulty manufacture Impressed - An imitation watermark impressed on the stamp by die-stamping Imprint - Name of printer or issuing authority printed on the sheet margins, or on the stamps themselves