sextant | eBay
Consult EBay. Out of hundreds of "sextant" listings, most are decorative knock-offs or
cheap tat. But there are a few of the real things there. I suggest you have the item evaluated for condition, index issues and functionality. Selling it as a semi-antique instrument yields one
price, but if it works and you can back up "the story", then you can ask a higher
price because it's not just a nautical knick-knack.