Two stamps still joined together either horizontally or vertically. If the sheet gutter runs between, they are known as a gutter pair.
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“...At once authoritative and compelling." Royal Mail’s British Philatelic Bulletin |hello@philatelicdatabase.com
[…] specimens with inverted frame will perhaps suffice, though he should also be on the look out for pairs and blocks in which the inverted frame occurs se-tenant with the normal. The distinction between […]