A very fine and good-sized pair of 17th century brass single-handed navigational dividers. Likely Dutch. Historically used for mathematics or chart reading, these have an intact and even brown patina.
Similar examples can be seen in the portrait of instrument maker Elias Allen (final image) and in various collections including the London Science Museum, Oxford History of Science Museum, and National Maritime Museum:
Condition: Small area of verdegris on one leg and divot on joint, see photos
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Instrumentum is based in the United States and specializes in high quality 17th and 18th century scientific instruments for architecture, mathematics and navigation. We have collected antique instruments for over 20 years with a focus on early and rare European architectural drafting sets, dividers, and rules. If you are interested in something particular please contact us at firstname.lastname@example.org. Image galleries of our inventory can be viewed on Pinterest and Facebook at the following links: