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We are the premier source for all versions of the Plath Navistar premium sextants and have sold more than any other dealer in the world!

We sold our last C. Plath Navistar Royal sextant Christmas, 2010, and have just replaced it with a Navistar Classic in like new condition. We only sell those that meet our standards for being in 5 Star Mint condition. These instruments were made in limited quantities, are rare, hard to find, and very much in demand by discriminating collectors and maritime industry professionals who still practice the art of celestial navigation.
This time we have one that has been owned by the same person for almost 30 years and has never been used. It’s perfect condition substantiates that claim.

There is an undated Plath instrument certificate with this instrument, but no manual. We have tested it thoroughly and can guarantee it is in perfect condition with ZERO index error. and only a smidgen of side error which is preferred. Based on our proprietary register of C. Plath instruments we can also date it by its serial number 61603, as being made in 1978.

Like new index mirror

Perfect horizon mirror

Special micrometer & vernier

Navistar imprint & serial number

It has a Mahogany wood case with the older style black Bakelite claw grip in operating condition. The index arm carries the Deutche Hydrographic Institute seal of approval which indicates this instrument was tested by DHI, and found to meet the more stringent standards for commercial use. Hence, this sextant sold for more originally then the regular Navistar Classic. Until the introduction of the Royal in 1990, the Navistar Classic was the top of the Plath line and both were made in limited quantities. It and the Royal were made with a guaranteed non-adjustable instrument error of 10 arc seconds or less. During most of it’s production, it sold for a premium over all Plath’s other sextants. For example, almost 30 years ago, they sold for over $1000.00, and as recently as 2001, the price had risen to $4000.00. Don’t confuse this model with the similarly named “Navistar Professional“ which. in our opinion is the worst sextant made by Plath or the “Navistar Traditional“ which was made shortly before sextant production ended. That instrument has nonadjustable error up to 20 arc seconds.

NOTICE: There are dealers who are selling a standard Plath Classic as a Navistar Classic to get a higher price. Here’s how you can be sure to get what you are paying for:
The true “Navistar Classic” can be identified by these clues:
it has a special micrometer drum
The Navistar brand imprint on the left arc.
The vernier has six indents and reads to 10 seconds of arc.
Comes with a fine wood case,
Has an instruction booklet, and Plath’s certification with matching numbers.
The higher grade Navistar’s have the imprint of the Deutche Hydrographic Institute dated 2/1/78 certifying them for commercial service. All these features are present with
this instrument except the instruction booklet.

PROVENANCE: This instrument was formerly the property of a yachtsman who owned a Swan 37 back in the early 1980’s, but who never took up the study of celestial navigation. He just thought he should have a sextant that was equal in quality to his Swan. For the seven year period from 1978 through 1985 only 1693 Navistar Classics were made. That is only 211 per year to satisfy worldwide demand.

CONDITION: The split image horizon mirror and the index mirror both are in “new condition“. The stainless and chrome fittings are all bright and shiny. There no evidence of use of the sextant. The frame’s paint is unblemished. The case has a some minor scuff marks, and scratches on its bottom and a few elsewhere. The lighting works. The
connection has been helped by a shim to assure contact. This is true of most C. Plath sextants, and many have a nonworking light. There is no manual. The original certificate of inspection is included, but undated. There is no index error and only a smidgen of side error which is a good thing. It operates like a well oiled piece of machinery, and has no mechanical faults.

Housed in sturdy Mahogany case

This C. Plath Navistar Classic requires someone who can appreciate the fine points of a sextant, and is willing to pay an appropriate price for this level of quality and excellence. It is suitable for a collector or for use at sea.

STAR RATING: This fine Collector Quality instrument
rates 5 STARS


QUALIFICATIONS: We are one of the few company’s still selling
navigation instruments that know anything about them. For purposes of judging whether Joel’s opinion counts, he
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. Joel is a retired Master Mariner, and held a U.S. Navy “D” Qualification as a Senior Skipper – Oceans. For six years he was a Varsity Offshore Sailing Team Coach at the U.S. Naval Academy. Some of his memberships include the: Association of Naval Aviation, Silver Wings, The Tailhook Association, Naval Academy Sailing Squadron, McCampbell’s Aces Squadron, Naval Historical Foundation, and the Naval Order of the United States.

COMPANY HISTORY: In brief, Carl Plath started manufacturing sextants, in addition to other nautical products, in Hamburg Germany in 1862 though the company’s origin dates back to 1837. As a result WW II, C.Plath was dismantled completely by the occupation forces. Around 1950, various prohibitions were lifted, and C. Plath was allowed to begin production again of sextants and other nautical instruments. Also in 1949,C.Plath was offered a gyrocompass patent and in 1951 the first gyrocompass designed to this patent was presented to the public. C.Plath progressed from the role of instrument maker to that of a modern marine navigation equipment manufacturer. In the following years the
product range was expanded by many more modern designs such as autopilots, speed logs, radio direction finders, etc.
In 1962 C.Plath was acquired by Litton Industries, a large American concern.The C.Plath North American Division was set up in 1978 in College Park near Washington. 1996 saw the introduction of the world’s first fiber-optic solid-state gyrocompass by C.Plath. The first ever gyrocompass with no moving parts. Sperry Marine was formed in 1997 with the combination of C.Plath, Decca Marine and Sperry Marine with more organizational changes yet to come. After 163 years, C.Plath changes its name to Sperry Marine in May 2000. In 2001 Sperry Marine becomes part of the Northrop Grumman Corporation. Directly thereafter, C. Plath quit producing sextants. The parent company has completely liquidated everything including machinery, equipment and spare parts.


Measuring Range: -5 to 125 degrees
Telescope: 4 x 40 Coated optics
Frame: Bronze with black enamel paint and bronze arc.
Micrometer Drum and Vernier Scale: reads to 10 seconds of arc
Index Mirror: 56 x 42 mm. aluminized on the rear side.
Horizon Mirror: 57mm diameter.

4 for index mirror
3 for horizon mirror
Weight sextant: 4.2 lbs, Weight case
6 lbs

1 C. Plath Sextant frame
1 4 x 40 star scope
1 Mirror adjustment tool
1 Brush
1 Varnished Mahogany sextant case

contiguous States, $25.00

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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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