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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.


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.

Therefore, it brings us pleasure to present a used 1978 Tamaya
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.

CONDITION: Irrespective
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.


Measuring Range: -5 to 125 degrees
+/-12 seconds.
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.
has 5 marks & reads to 0.2′.
Index Mirror: 57 x 42 mm. aluminized on the rear side.
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.

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Shipping & Packaging

The cost of shipping, packing, handling, and insurance to your destination, will be calculated point to point and is an additional charge. You may email us to get these costs. We price our shipping honestly, but we expect to be reimbursed for the nominal cost of packaging materials and handling.

Our Unconditional 'No Nonsense' Guarantee

If not completely satisfied with your purchase it may be returned, if without damage, within three days of receipt in its original packaging. Return items must be insured for their full value. Only a prior email authorization by us for the return is required. Shipping charges are refundable if due to our error within the continental United States.

International buyers welcome, but inquire first. We have satisfied customers worldwide.

Standard Forms of Payment

Bank wire transfer, cashier’s check, money order, or personal check in which case the item will be held until cleared. Our prices are quoted net to us so that the use of credit cards or PayPal incur extra charges. Terms on overseas sales are different.

Established in 2003

Celebrating 18 Years of Exellence in Nautical Antiques

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