According to the Archives of Montres Breguet, the present marine chronometer No. 5001 “horloge marine à un barillet, petit modèle” was sold on 10 April 1835 to Torcapel for the sum of 1,100 Francs.
Little is known of Torcapel although his name appears in the Breguet archives at least once before when only eight months earlier he purchased an almost identical chronometer, No. 4980, also for 1,100 Francs. The present chronometer was subject to a complete overhaul in September 1989, from 29 September 1989 until 16 February 1990 it was regulated and the results recorded in the accompanying register.
Breguet’s chronometers with a single going barrel were in fact developed by Abraham-Louis’s grandson Louis Clément François Breguet after his return from Switzerland. These chronometers were intended for Merchant marine or private use instead of the regular double barrel type made by the firm for the Marine.
The easily removable platform escapement is another example of Breguet’s ingenuity. The whole platform can be removed from the main assembly due to a small device locking the going train automatically, even when fully wound. This means that if damaged, the delicate escapement can be temporarily replaced and sent separately for repair to a specialist chronometer maker whilst the main part of the movement could be repaired by any competent clockmaker.
For a comprehensive account of Breguet’s marine chronometers see Breguet, Watchmakers Since 1775 by Emmanuel Breguet, pp. 245-249, and The Art of Breguet by George Daniels, pp. 84-87, and p. 286, pl. 361a & b.