Tamaya Tokyo Drum Sextant with Wooden Case – Vintage Marine Navigation Instrument

This Vintage Tamaya Tokyo Drum Sextant served as a navigation instrument aboard yachts and training vessels for celestial positioning. Mariners relied on sextants like this to determine location at sea using the horizon and celestial bodies during offshore travel.

A sextant measures the angle between two visible points through mirrors, filters, and a graduated arc. Additionally, the drum micrometer adjustment allows precise readings, while the open frame design keeps the instrument lightweight and practical for onboard navigation.

This Tamaya sextant retains its telescope, index arm, and optical filter system used for accurate measurements. Furthermore, the graduated arc displays the Tamaya Tokyo marking, confirming its origin and maritime manufacture.

Included Components and Features:

• Telescope sight assembly
• Drum micrometer adjustment and quick clamp
• Index and horizon mirrors with adjustment screws
• Multiple hinged sun and horizon filter shades
• Lightweight navigation frame with graduated arc
• Original fitted wooden storage box

Condition:

The wooden case is present but shows significant age and wear, including cracking and surface damage. Finish wear, surface marks, and oxidation reflect normal handling and marine storage.

This sextant has not been tested for navigational accuracy and is being sold as-is. It remains a strong display piece suited for maritime collections, nautical offices, libraries, or coastal interiors.