Jean-Aimé Jacob was born circa 1793 and died in 1871. He is attributed with making high quality chronometers and regulators but precious little has been recorded about his work. He is purported to have been a pupil of Breguet's which would go a long way to explain the similarity of his work and that produced by Maison Breguet.
He founded a workshop in St. Nicholas d'Aliermont near Dieppe which was fast becomming the center of French carriage clock making. His associations with the Breguet workshops apparently continued for he is recorded in their records as having made certain parts for carriage clock No. 3050 in 1821, see C. Allix op. cit. and presumably he continued to make others for them. P. M. Chamberlain p. cit., mentions Jacob 'whose clocks are famous' and the influence of Breguet on his work.
The most remarkable features of the clock are the pendulum and the escapement. Both are obviously out of the Breguet mould. The pendulum bob bears a certain similarity to the double regulator No. 3671 op. cit made for George IV at a cost of *1,000 and delivered in 1825 but there the similarity ends because the methods of compensation could not be more different. Tardy op. cit illustrates a clock by Jacob with a compensated pendulum but of a more conventional type and almost certainly 20 years earlier in date.
The escapement, though not exceptional in complexity, is almost identical to others used in regulators by Breguet right down to the twin steady-pin setting for the crutch-piece connection, see Tardy op. cit. p. 343