The safest first test is to look for how the stamp is attached and whether it was designed to separate in water. Recent U.S. self-adhesives often have an oil-based backing and may not soak off normally, so identification should be careful and methodical.
Start with the portrait rule: Great Britain is the only country permitted to issue postage stamps without its name. Then use safe, methodical clues like catalog illustrations, perforations, and watermarks to narrow uncertain matches without damaging the stamp.
Start by checking the issue period and backing clues, then use a cautious test rather than force. Older self-adhesives often soaked off, while many current U.S. self-adhesives have oil-based backing and need a different approach.
Not all self-adhesive stamps will soak off in water. Current U.S. issues may have oil-based backing, so identification starts by checking the stamp’s type and handling the piece safely before you try any removal method.
The safest way to identify stamp perforations is to compare the hole pattern along the edges with a perforation gauge, then confirm the result in a catalog. Handle dry stamps lightly with tongs and use magnification when details are close.
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