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Stanley London Mark 3 Sextant with
3.5 X 40 Telescope and Hardwood Case.
New and Fully Calibrated.
Compare Similar Sextants at $2,400.00
Now Only $659.00
3.5 X 40 Monocular Telescope Included with Purchase

Custom Engraved Brass Plaques Available for Hardwood Case

New Fully Calibrated Stanley London Mark 3 Sextant with 3.5 X 40 Telescope and Hardwood Case
Stanley London Mark 3 Sextant with 3.5 X 40 Telescope
Click on any of the thumbnail images for a detailed picture.
Stanley London Mark 3 Sextant with Certificate of Qualification
Mark 3 Sextant with
Certificate of Qualification
Stanley London Mark 3 Sextant with Certificate of Qualification and Accessories
Sextant with Documentation
and Accessories
Micrometer Drum on Stanley London Mark 3 Sextant
Micrometer Drum on Stanley
London Mark 3 Sextant
Filters on Stanley London Mark 3 Sextant
Filters on Stanley London
Mark 3 Sextant
3.5 Power Telescope on Stanley London Mark 3 Sextant
Telescope on Stanley London
Mark 3 Sextant
Grip and LED Lighting Power Switch on Stanley London Mark 3 Sextant
Grip and LED Lighting
Power Switch
Detail of Index Mirror on Stanley London Mark 3 Sextant
Detail of Index Mirror
on Mark 3 Sextant
Detail of Horizon Mirror / Glass on Stanley London Mark 3 Sextant
Detail of Horizon Glass
on Mark 3 Sextant
Detail of Index Mirror Filters on Stanley London Mark 3 Sextant
Detail of Index Mirror
Filters on Sextant
Detail of Horizon  Mirror / Glass on Stanley London Mark 3 Sextant
Detail of Horizon Glass
Filters on Sextant
Detail of Mirrors and Filters on Stanley London Mark 3 Sextant
Detail of Mirrors and
Filters on Sextant
Detail of Telescope Height Adjustment on Stanley London Mark 3 Sextant
Detail of Telescope
Height Adjustment
Detail of Micrometer Drum Readout on Stanley London Mark 3 Sextant
Detail of Micrometer
Drum Readout
Built-in LED Illuminator for Micrometer Drum Readout on Stanley London Mark 3 Sextant
Built-in LED Illuminator for
Micrometer Drum Readout
Precision Worm Gear for Micrometer Drum on Stanley London Mark 3 Sextant
Precision Worm Gear
on Micrometer Drum
Stanley London Mark 3 Sextant on Beautiful Hardwood Case
Sextant on Beautiful
Hardwood Case
Stanley London Mark 3 Sextant in Beautiful Hardwood Case
Sextant in Beautiful
Hardwood Case
Beautiful Hardwood Case for Stanley London Mark 3 Sextant
Beautiful Hardwood Case
for Mark 3 Sextant
Beautiful Hardwood Case for Stanley London Mark 3 Sextant Standing Up
Hardwood Case
Standing Up
Rubber Feet on Two Sides of Hardwood Case for Stanley London Mark 3 Sextant
Rubber Feet on Two
Sides of Hardwood Case
Stanley London Mark 3 Sextant with 3.5 x 40 Scope and Hardwood Case.
New and Fully Calibrated.
Only $659.00
The Stanley London Mark 3 Sextant represents the best quality marine sextant on the market for the price.  This is not a reproduction, but an accurate and calibrated fully functional nautical sextant for marine navigation.  The Mark 3 sextant incorporates all of the features of high-end German and Japanese sextants, at approximately one third the cost.  Do not be mistaken: This is a very accurate instrument of very high quality.  How can it be sold at one third the price?  The Mark 3 Sextant is made in China, where labor rates are considerably lower than in Germany or Japan, but where high quality equipment is available.  Further, the Mark 3 Sextant uses a lightweight, corrosion-resistant aluminum alloy, just as Freiberger, Tamaya, and C. Plath do in their lightweight sextants.  As a result, there is a very minor sacrifice in potential accuracy (+/- 20 arcseconds throughout the arc, compared with +/- 10 to 12 arcseconds), which is inconsequential compared to the human error when taking sights from a moving small vessel.  This Mark 3 is actually used by many professional navigators.
The Mark 3 sextant has revolutionized celestial navigation:  Never before has such a high-quality, accurate metal sextant been available at such a low price.  Tests by professional navigators produce results that rival those of the most expensive German and Japanese models.  This aluminum-alloy instrument at only 2 pounds, 8 ounces (1.13 kg) is easier to use than the traditional 4-pound brass models.  The quality of the Stanley London Mark 3 Sextant has been proven in many years of use by ocean-going navigators.  It is highly unlikely that any navigator regardless of experience could perform more accurate navigation underway in a small vessel with any other sextant, including those costing $2,400 or more.
The sextant's full 50 mm mirrors and shade glass are precisely machined and extensively tested for flatness using the Fresnel diffraction pattern method.  Mark 3 Sextants are assembled in a professional modern clean-room environment.  The sextant has the look and feel of a fine piece of precision engineering and is built to a very high standard.
The Mark 3 sextant's LED lighting of the arc and drum allows for convenient night sights.  Two standard AA batteries fit in the sextant's handle (batteries not included), and a convenient thumb switch controls the lighting.
The Stanley London Mark 3 Sextant comes complete with a high quality 3.5 x 40 scope.  The scope has fully coated optics and a large 40 mm objective lens to yield a sharp 3.5-power non-inverted (upright) image.  Most sextants, like our Tamaya Spica Sextant, and our Tamaya Jupiter Sextant require optional $300 - $400 scopes.
The sextant comes with a beautiful, high quality hinged hardwood case to store and protect the instrument.  The case has a handle, two secure latches, and rubber feet on both the bottom and the back of the case to protect both the sextant, and your fine furnishings.  The case can hold the sextant, accessories, and two telescopes.
A handsome custom engraved brass plaque can be mounted on the front or the top of the hardwood case.  The plaque on the top of the box can have just the recipients name, name and date, or a very long message.  We can even engrave graphics including a high quality line drawing of the vessel.  The brass plaque on the front can have up to 7 lines of text and up to 15 words per line.
The Stanley London Mark 3 Sextant includes high quality sextant oil, an adjusting wrench, a brush, lens cloth, and a Quality Certificate specifying the sextant's +/-20 arcsecond accuracy throughout the arc.

Specifications:
Frame: Lightweight Sea Water Resistant Aluminum with Corrosion Resistant Finish
Measuring Range: -5 to 130 degrees
Arc Radius: 153 mm
Guaranteed Accuracy: +/-20 arcseconds throughout the arc
Division on drum: 1 arcminute
Division on vernier: 0.2 arcminute
Index Mirror: 50 mm diameter
Horizon Mirror: 50 mm diameter
Illumination: LED Arc and Vernier with Push Button on Handle
Illumination Power: 2 AA Batteries (not included)
Shade glasses: 4 index shade glasses; 3 horizon shade glasses
Dimensions of Sextant: 9 3/8 inches (23.8 cm) wide, 9 inches (22.9 cm) tall, 5 1/4 inches (13.3 cm) deep
Weight of sextant: 2 pounds, 8 ounces (1.13 kg)
Dimensions of Case: 13 inches (33 cm) wide, 10 1/2 inches (26.7 cm) deep, 6 1/4 inches (15.9 cm) tall
Accessories: Hardwood Case, Mirror Adjustment Key, Special Sextant Oil, Brush, Lens Cloth, Quality Certificate

This sextant has a unique serial number and is fully functional and factory calibrated for navigation.  The Stanley London Mark 3 Sextant with 3.5 x 40 Scope and Hardwood Case sells for only $659.00. 
We also offer the Tamaya Spica Sextant, the Tamaya Jupiter Sextant, and the C. Plath Decorative Antique Reproduction Sextant.

Stanley London Mark 3 Sextant with Scope and Case
Stanley London Mark 3 Sextant with Scope and Case
Status Quantity
 
$659
Confederate Non-Commissioned Officer's Sword with Leather Scabbard
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Silver Plated Liquid Damped Key Chain Compass

See our Full Line of Stanley London Sextants:
8-inch Brass Sextant
8-inch Vernier
Brass Sextant
British Admiral's Sextant
Brass British
Admiral's Sextant
6.5-inch C. Plath Brass Reproduction
6.5-inch C. Plath
Brass Reproduction
British Captain's Sextant
Brass British
Captain's Sextant
Titanic Limited Edition 6-inch Brass Sextant
Titanic 6-inch
Brass Sextant
6-inch Premium Sextant
6-inch Premium
Antique Sextant
6-inch Sextant
Six-inch
Brass Sextant
5-inch Rack and Pinion Sextant
5-inch Rack &
Pinion Sextant
Titanic 4-inch Brass Sextant
Titanic 4-inch
Brass Sextant
Serialized 4-inch Brass Sextant
Serialized
4-inch Sextant
4-inch Sextant with Antique Finish
4-inch Antique
Finish Sextant
Special Purchase 4-inch Brass Sextant
Special Purchase
4-inch Sextant
3.5-inch Sounding Sextant
3.5-inch
Sounding Sextant
3-inch Premium Quality Sextant with Leather Case
3-inch Premium
Quality Sextant
3-inch Sextant
Three-inch
Brass Sextant
3-inch Box Sextant
3-inch Brass
Box Sextant
Brass Sextant Key Chain
Brass Sextant
Key Chain
Small Sextant Plaque
Small Walnut
Plaque w/ Sextant
Small Sextant Plaque
3-inch Sextant
on Wood Plaque
Calibrated and Fully Functional Sextants
Tamaya Jupiter Sextant
Tamaya Jupiter
Sextant w/ case
Tamaya Spica Sextant
Tamaya Spica
Sextant w/ case
Stanley London Mark 3 Sextant
Stanley London
Mark 3 Sextant

[8-in. Sextant w/ Slow-motion]  [British Admiral's Sextant]  [6.5-inch C. Plath Reproduction] 
[British Captain's Sextant] [Titanic 6-in. Sextant]  [6-in. Premium Antique Sextant] 
[6-in. Sextant]  [5-inch Rack & Pinion Sextant]  [Titanic 4-in. Sextant]
[Serialized 4-inch Sextant]  [4-in. Sextant w/ Antique Finish]  [Special Purchase 4-inch Sextant]
[3.5-in. Sounding Sextant]  [3-in. Premium Sextant] 
[3-in. Sextant]  [3-in. Box Sextant]  [Sextant Key Chain]
[Small Sextant Plaque]  [3-in. Sextant on Plaque]  [Calibrated Tamaya Jupiter Sextant]
[Calibrated Tamaya Spica Sextant]  [Calibrated Stanley London Mark 3 Sextant]

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Copyright © 1998 - 2016 Stanley London, a division of Castle Navigation Inc. * All rights reserved
Stanley London is a registered trademark of Castle Navigation Inc.
All Information deemed reliable but not guaranteed * Revised 2/21/2012