• Many stamps are printed in stages - one color, or graphic at a time. Other times the printers test different colors which are never intended for release, these are sometimes called 'printer's waste'.

    [Below: Color phase]

    [Below: Color phases/tests]

    [Below: Color phases/tests and pairs with no perforation in the middle]

    [Below: Two sheets connected]

    [Below: Rare horizontal perforated sheet]

    [Below: Envelope from 1943]