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I have attached some photos of a Chas. C. Hutchinson sextant acquired for a (very) modest sum in an obscure on-line auction.  This sextant and a few other nautical items were up for auction in Missouri in what appears to have been an estate sale.  I entered the minimum bid and won.  

The sextant is very lightly used and shows no signs of corrosive damage from salt water or salt air.  It has all the bits and pieces, except the key to the wooden case.      

Hutchinson was a well-established purveyor of nautical and surveying instruments in Boston in the latter 1800s and early 1900s.  See link below.  He appears to have imported many or all of his merchandise from England.    

Two mentions are engraved on the arc of the sextant:   “Chas. C. Hutchinson. Boston ” and “ENGLISH.” 

This sextant appears to be a well-made but rather ordinary instrument.  What is extraordinary, however, is that it survived in such fine condition.   

I apologize for the mediocre quality of the photos.  It's about the best I could do with an iPhone camera and natural lighting.  The photos show the sextant in untouched, as-found condition.    

JMcD

https://books.google.com/books?id=vxxEAQAAMAAJ&pg=PA211&lpg=PA211&dq=chas.+hutchinson+boston+nautical&source=bl&ots=h5ynruhEV1&sig=DTd6LEFMAj8wFQr9is758P0nsbg&hl=en&sa=X&ved=0ahUKEwjJ18K9657ZAhXPzlMKHfpXDYY4ChDoAQhLMAk#v=onepage&q=chas.%20hutchinson%20boston%20nautical&f=false