Frodsham & Keen – Liverpool 3 Ring Sextant/Quintant

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Frodsham & Keen of Liverpool


Early 20th Century

Frodsham & Keen of Liverpool Sextant/Quintant

Presented is an antique quintant, meaning a sextant having a range of 144°, or an arc of 72°, by Frodsham and Keen of Liverpool, England, dated October of 1920.
(There is an identical instrument by this constructor shown in” Sextants At Greenwich” from the National Maritime Museum, Greenwich, England.)


Frodsham & Keen of Liverpool Sextant/Quintant

This fine instrument has a rare three-circle frame. This is the second Frodsham & Keen Sextant that we’ve been able to offer for sale,  It comes with a star scope, a collimation scope, and a sighting tube for shooting terrestrial objects, as shown housed in the case pictured above.

The bronze arc is calibrated -5 to 140+ degrees with a vernier that reads from the right, from 0 to 10 seconds of arc. The sextant has four index shades and three horizon shades.

Inscription “Frodsham & Keen  Liverpool”

The instrument is housed in a fitted wood-carrying case with brass hardware. The case is in good condition with a nicely aged finish. There is a crack across the top. One would expect to find evidence of use at sea in the form of scratches, small chips, and age cracks mentioned only to be complete. This is a very fine example of the Sextants/Quintants of the period. It will make an excellent addition to an important collection or as a gift of importance.


Frodsham & Keen of Liverpool Sextant/Quintant

Back of Sextant

This  sextant/quintant is a very fine example of the period, making it ideal for the serious collector or as a presentation gift

View of the Index and Horizon Mirrors, and six shades


Star scope, Collimation scope, Sighting tube

Length of index arm   9 1/4″

Width of arc                10 1/2″

Diameter  1 circle         2 1/2″ ID Index
Mirror                 47 mm x 30 mm

Horizon Mirror             32 mm x 22 mm

SEXTANT WEIGHT    3 lbs 9 oz

Case: 10 1/4″ x 10 3/4″ x 5 1/4″               Weight in Case:  8 lbs. 10 oz.


Hezzanith Observatory Certificate and Case

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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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