The Mondani Collection of Rolex Wrist...

Geneva, May 14, 2006

LOT 575

?Two-Day Marine Timekeeper with Split Seconds? G(eorge) G. Grant, London, Invenit et Fecit, A.D. 1897. Fine and very rare, two-day portable marine timekeeper with split seconds, lever escapement, special patent adjustment mechanism for setting the seconds hand and regulator dial.

CHF 25,000 - 30,000

EUR 16,000 - 20,000 / USD 19,000 - 23,000

C. Brass marine type drum case with glazed panel in the base for viewing the platform, screwed-down bezel, winding aperture and split seconds button in the side. D. Silvered, regulator type, subsidiary dials for the hours with radial Roman numerals, up-and-down and seconds dial inscribed ?Recedens Etiam Progredior?, outer minute track with Arabic five minute numerals. Blued steel ?spade? hands. M. 73 x 73 mm., brass plates, four ring-turned pillars, fusee with chain, Harrison?s maintaining power, circular platform mounted on a toothed wheel and engaging with a steel worm screw and rotating about the axis of the fourth arbor to allow accurate setting of the seconds hand, jeweled lateral lever escapement, pallets and impulse pin jeweled, cut bimetallic compensation balance with segmental weights, meantime and temperature adjustment screws, free-sprung blued steel balance spring with triple overcoil, diamond endstone, split seconds mechanism controlled by a heart cam between the dial and frontplate. Dial signed. Dim. 127 x 80 mm To be sold without reserve


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Grading System
Grade: AA

Very good
Case: 3-8

Good

Slightly scratched
Movement: 3*

Good

Overhaul recommended, at buyer's expense
Dial: 3-01

Good

HANDS Original

Notes

This most unusual timekeeper incorporates a type of split seconds chronograph mechanism able to record intervals of less than a minute only. Fine adjustments can be made to the setting of the seconds hand without otherwise disturbing the timekeeping. The English patent for this mechanism (No. 2198) was applied for by Grant on January 31st, 1899. Provenance: Time Museum Inventory, No. 2490. Literature: Randall, catalogue No. 71.