How to find hidden watermarks on your postage stamps
Discover the hidden rarities in your stamp collection by unveiling the watermarks.
The Stanley Gibbons Detectamark can detect all Great Britain issues and provides clean, safe and effective watermark detection without the use of chemicals and also helps detect minor damage such as thins, tears and repairs.
It is constructed from a robust metal alloy and can be used with batteries or an adapter, which is available seperately. ( SG Watermark Detector 2570 )
Watch this video demonstration of the Stanley Gibbons Detectamark, a fantastic tool to help stamp collectors find hidden watermarks and flaws on stamps:
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