English very rare silver inking chronograph watch Circa 1872

Very rare inking chronograph
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An English very rare and possibly unique large silver keyless open faced inking chronograph watch, circa 1872, gilt finished three-quarter plate movement, ratchet tooth lever escapement, the winding and setting mechanism visible to the back-plate, bimetallic compensation balance, white enamel dial, central minute recording hand with inking nib, upper subsidiary seconds dial with further inking nib, hour recording dial below, large and heavy plain polished silver case with stepped bezels, stop/start slide to the band at eleven o’clock together with nib-piece for resetting chronograph in tandem with the large knurled winding button, dial and movement signed Barraud & Lunds, 41 Cornhill London.
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Diameter: 85 mm
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Signed: Barraud & Lunds 41 Cornhill London
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To date, this is the only known example of an inking Chronograph by Barraud & Lunds. 

Fredrick Fatton invented the Inking Chronograph in 1822.

Fifty years later, Barraud & Lunds made an improved chronograph. The firm based their piece on the same principles of the Fatton, but incorporated minute recording ability and keyless winding. Furthermore, the present lot, with a diameter of 85 mm, measures a full 27 mm larger than the Fatton, whose diameter is 58 mm.