Proof 1971 National Insurance imperforate proof sheet (60) of the frame in black, on ungummed paper perforated "SPECIMEN" at irregular intervals; also samples and schedules of high value National Insurance stamps
Proof 1971 National Insurance imperforate proof sheet (60) of the frame in black, on ungummed paper perforated "SPECIMEN" at irregular intervals; also samples and schedules of high value National Insurance stamps
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