The overall condition of this prestige sextant is superb. It
is just waiting to go back to sea and where it can be put back to use. It also is perfect for a serious student who is
seeking something special.
TAMAYA MS 833 JUPITER SEXTANT,
800.00 PLUS $25.00 SHIPPING AND HANDLING TO 48 contiguous STATES.
We’ve been involved selling Tamaya sextants for over 30 years,
and back then, our company Nautech Maritime Corporation was instrumental in the design and introduction of their
MS 733 SPICA, MS 833 Jupiter, and MS 933 Venus sextants and the famous NC 2, and NC 77 navigation computers.
Jupiter sextant, Serial Number 60659, with a 4 x 40 scope which is in exceptional condition, and
shows little evidence of use. The case is a dark rose colored wood which is typical of
those of that era.
of age, overall condition, is “as near new”. Adjustable index and side error are nil. All moving parts
turn freely. Nothing is broken. The illumination works. The only exception is a small scratch on the handle.
Mirrors are perpendicular to frame. Both mirrors are without blemish. The case is in excellent condition. The
sextant’s paint is as new. All the numbers match. There is no reason to grade this sextan anything but exceptional.
STAR RATING: Without qualification, this
instrument rates 5 STARS
QUALIFICATIONS: For purposes of judging
whether my opinion counts, I was the editor of the chapter on sextants of the 1977 Edition of “Bowditch”, The American Practical Navigator, NAVPUB 9; a member of the U.S. Naval Academy Navigation Symposium Board, 1975-1978; the author of a book on marine sextants, Cornell Maritime Press,1975, and the founding president of Nautech Maritime Corporation which partnered with Tamaya of Japan in the introduction of the MS 733 Spica, the MS 833, Jupiter, MS 933 Venus sextants and the famous NC-2 navigation computer, in the U.S. market. I am also a retired Master Mariner, and formerly held a U.S. Navy “D” Qualification as a Senior Skipper – Oceans.
Model 833 JUPITER SPECIFICATIONS:
Measuring Range: -5 to 125 degrees
Telescopes: 4x40mm: angle of view 7 degrees, relative brightness 100. All optics are fully
Frame: Lightweight die cast aluminum alloy with corrosion resistant black finish. Bronze arc.
Scale: has 5 marks & reads to 0.2′.
Index Mirror: 57 x 42 mm. aluminized on the rear side.
Mirror: 57mm diameter.
1. 4 for index mirror
2. 3 for horizon mirror
Weight: 3 lbs 12
oz, 7 lbs in case
Carrying case: Wood
- 1 Tamaya Nautech Model 833 sextant frame
- 1 4 x 40 Star scope
- 1 Mirror adjustment wrench
- 1 New style plastic sextant case
- 1 Tamaya Certificate of Accuracy
- 1 Original manufacturer’s manual
Batteries not included. They should be inserted with the positive terminal to the top.
For those seeking more information about the modern marine sextant I suggest they get a copy of a book written in 1975, now out-of-print. The Myths & the Truth about Selecting a Marine Sextant. Cambridge MD: Cornell Maritime Press, 1975. 44pp, 10 illustrations. Topics include scope power, mirrors, shade glasses, theoretical brightness, accuracy, workmanship, accuracy, comparison of specifications. It is available at the University Library, all locations, of The California State University for free.