James Upjohn, London

AN EXTREMELY SLIM GOLD DEMI-SKELETONISED BAGNOLET-TYPE WATCH WITH DOUBLE WHEEL DUPLEX ESCAPEMENT CIRCA 1800, NO.7506

• Movement: bagnolet-type reversed calibre with female winding square, the front partially skeletonised, double wheel duplex escapement, flat balance, diamond endstone, the backplate with inset regulation dial, signed and numbered Jas. Upjohn, London, 7506
• Dial: white enamel chapter ring, the centre skeletonised to reveal the movement, blued steel hands
• Case: ultra slim gold case, the back centred with a plain polished hinged panel opening via a pusher to the pendant to reveal the movement's backplate, framed by a decorative engine-turned border, scooped bezel
• Key: short chain with male key and matching engine-turned decoration
diameter 59mm