A very fine pair of 17th century brass dividers. Likely Dutch or German. Historically used for mathematics or chart reading, these have a makers hallmark in the form of a goblet.
Similar examples are in the Smithsonian collection of scientific instruments:
12.8 cm / 5 inches
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Instrumentum 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: