Practical, source-backed guides for identifying, valuing, preserving, and organizing a collection.
Modern postage stamps often combine multiple printing methods, such as line-engraved intaglio and offset lithography, on a single design. Learn how to safely identify these combined processes using cumulative visual clues, non-contact magnification, and oblique lighting.
Read articleOffset lithography is a widely used planographic printing process for postage stamps. Learn how to safely identify lithographic stamps by analyzing cumulative visual clues under magnification and comparing them with other major printing families.
Read articleCollectors often wonder how to tell intaglio (line-engraved) from gravure printing on stamps. This guide explains the key differences, safe identification steps, and why combining clues is essential for accuracy.
Read articleCollectors often ask how to identify the printing method used on a postage stamp. This guide compares the four broad families described by the American Philatelic Society: line-engraved intaglio, gravure, letterpress, and lithography. It uses safe visual inspection and treats every feature as supporting evidence rather than a stand-alone diagnosis.
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