1836 Hunt and Roskell were retailers of fine jewelry and watches in London during the 1800s. This pocket chronometre has its escapement mounted on a tourbillon -- a constantly rotating carriage that reduces errors in timekeeping when the position of the watch changes. Hunt and Roskell, London Fusee, spring detent escapement, balance with spherical spring, temperature compensation (P&E CAI-299)
aperture=f9.0 focal length: 60.0 mm exposure 1/800 sec ISO: 3200