Meaning a stamp which has been deliberately printed or issued without perforations. Typically imperforate stamps were printed between 1840-1850 these stamps might have been cut out from a sheet. Since this time fewer imperforate stamps have been issued. Stamps are now separated in a number of ways
- perforation: cutting rows and columns of small holes
- rouletting: small horizontal and vertical cuts
- die cutting cut paper to shape using a metal die