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This is very surprising:
The sextant in the first link is definitely a Soviet-made SNO-T.
Complete with its accessories and the ugly grey box, yellow inside.
But the certificate says "Sewell".
What do Sewel (and/or Cassens-Plath!) have to do with a SNO-T ??

Alex.

________________________________________
From: NavList@fer3.com [NavList@fer3.com] on behalf of Greg Rudzinski [NoReply_Rudzinski@fer3.com]
Sent: Thursday, May 11, 2017 11:58 AM
To: eremenko@math.purdue.edu
Subject: [NavList] Re: Sextant Repairs

Graham,

This looks to be the same sextant as a USSR SNO-T.  Best luck for parts would 
be on E-bay. Look for a complete horizon mirror with frame. Read up on the 
Bill Morris blog for this particular sextant. There is a trick to the 
collared adjustment nuts to prevent stripping and damage.

https://www.worthpoint.com/worthopedia/sewills-cetus-prima-marine-sextant-453709473

https://sextantbook.com/category/the-ussr-sno-t-sextant/

Greg Rudzinski

   

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