Barraud, Cornhill, London, 1526 The three part case with (replaced) solid top lid over a mid section with inlaid plaque, the lower section with side swing handles, with a felt line base, the 4.75 inch silvered dial with narrow sight ring framing the minute track and Roman chapters, the XII intersected by the large Arabic seconds ring, the power reserve in days shown through a curved aperture below the centre, with blued steel hands, the chain fusee and barrel mounted in shaped plates united by three turned pillars, the escapement set in a smaller pair of plates with a blued steel helical hairspring to a cut and compensated bimetallic balance with Earnshaw type detent escapement, with Harrison's maintaining power and wound via Barraud's typical folding key secured to the fusee arbor through the back of the gimballed bowl, the bowl with integral winding key 19cms (7.5ins) wide.