The Royal Philatelic Society London
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Source Ref:
5114
Dataset:
RPSL_MUS
Date Loaded:
12 Mar 2024 11:05:40
Item Information
Record Type:
Museum Objects
Source Record Type:
SET
Item Title:
Watermark detector - Signoscope Safe T1. In two parts - power supply and viewer. Used for stamps up to 2 x 2 inches. Can be powered by batteries or mains. Optical watermark detector which refracts light from a 7.5 volt bulb through a perspex block to show the differences in paper thickness and will also highlight paper thins and repairs. Used for high volumes of stamps and for more difficult watermarks as it has a dimmer switch making the light source.
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Subject:
Great Britain
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Publication Place:
United States of America : United States of America
Language:
English
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Physical Description:
height whole mm 45 width whole mm 100 depth whole mm 45
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Date:
1950 to 1980
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