1850s Rupp Desilva Nautical Sextant Maine Ship Captain

1850s Rupp Desilva Nautical Sextant Maine Ship Captain
Spectacular dated 1854 sextant with case, two eyepieces, and adjustment key. I believe the instrument to have been made by Desilva of Liverpool, England, and sold through Michael Rupp & Co. of New York, and later possibly serviced or calibrated by John Bliss & Co. -- labels from all three outfits are still affixed to the inside of the case. The sextant itself bears a label that reads "W. Desilva, Liverpool, S.S. Thayer, JANy 1854." Everything moves smoothly, and the scale on the arc is easily readable. See condition report below (as well as the 25 images) for more details.
This piece is being sold by the family of the late great-grandson of S.S. Thayer, who was a ship's captain who sailed out of South Thomaston, Maine, from the middle to late 1800s. (I thought at first that "S.S. Thayer" was the name of the ship, but according to the consignor, it's the name of the captain.)
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