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Navigators dividers -often called calipers.

Used to measure distance based on scale.

Upper part with hinge made from solid brass to prevent rust.

Upper part shaped semi circular allowing gap distance movement with one hand -hence description of single handed or one handed.

The hinge screw can be adjusted.

The lowers points are made of stainless steel for sharpness and accuracy.

Still used in learning to read charts for sea mastering qualifications.

Fabulous nautical artifact or collectable.

Dimensions:

Overall Length: 180mm

Maximum open width: 203mm