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Watermarks are thickening and/or thinning introduced into the paper of the postage stamp to make forgery more difficult. Most catalogs indicate when a stamp has or may have a watermark. Sometimes stamps have been issued with and without a watermark. Therefore it is useful to be able to see whether the stamp has a watermark or not. Sometimes a watermark is immediately visible on the postage stamp. It can also happen that it is not immediately visible. Partly because some stamps have only part of the watermark (because the watermark is placed in the sheet of stamps, instead of on each stamp separately) There are several ways to check if the stamp has a watermark. Sometimes if they are of thick paper and there is a lot of relief, you can feel or see the watermark by holding the stamp up to a bright light or against a black background. If this does not make it easily visible, you can also use tools.
The simplest system is with e.g. benzene or a liquid that makes the watermarks visible. A common method is to put the stamp in a black container and put a drop of benzene on it. Then the relief expands a bit and the watermark is easier to see. However, we recommend always to be careful that this does not damage the stamp. With some stamps this can cause a chemical reaction that damages the stamp. For example, that the ink of the stamp fades or runs out.
Another method without risk to the stamp is through light and or some pressure on the stamp. The light can often be set in different brightnesses and colors, and the pressure can also be increased by a handle or screw. Since you do not have to maintain the pressure yourself, you can view the watermark at your leisure. These models run on battery or mains power with an adapter. Because these work with light and pressure, other abnormalities such as repairs or paste residue are also seen. Thus, these can actually be used for recognizing repairs, for example. Just keep in mind that this can affect the image, as far as the watermark is concerned.
This Signoscope T3, is the first optical-electric watermark search and test device used thousands of times worldwide. The device works completely without chemicals and therefore without danger to the stamps. It is extremely easy to use.
The special feature of this Signoscope T3 is that you have A total of 8 different colors: Brown, red, green, blue, yellow, cyan, violet and natural white daylight as the central examination light. These different colors can significantly improve the examination result, for example, illuminating a stamp with a green backing with green light, virtually eliminating the green color that may show through on the back of the stamp. The watermark now stands out more clearly and is no longer disturbed by unwanted color influences.
In addition, the new Signoscope T3 is much more powerful; it works with 3 strong LEDs, which are also hardly subject to wear and tear and are very energy-saving.The LED light sources are infinitely dimmable. This means that you can find the optimal lighting for each stamp under test, because it is not always the case that the maximum light radiation shows the watermark at its best. The maximum size of the postage stamp to be tested is 50 x 43 mm.
For more explanations or specifications, you can download the corresponding Manual and User Guide here.
The Signoscope is equipped with a 220v power supply, a USB cable for connection to the PC or to a Powerbank.
Discover now the wide range of Equipment from the various suppliers.
In our webshop you can find the necessary Accessories and Spare parts for your equipment.
Dimensions: 210 x 115 x 145 mm.
Packaging is per piece.
