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Force 4

Observatory Magnifier

Force 4 Observatory Magnifier
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Dr Crabtree’s Patent Observatory Magnifier
Believed by some to have been designed in 1804 by the legendary British inventor and polymath Joseph Crabtree, the functional simplicity of his brass-and-glass domed "Observatory" magnifier has never been surpassed or needed modification.
• Ideal for viewing details on nautical charts
• Magnifies about 3x.
• Diameter: 50mm, Height: 25mm

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