Happy New Year! Your jam jar (confiturier) was made in Paris by Pierre Bourguignon, general silversmith, working at 222 rue St-Honoré. His mark was Initials PB, symbols a carafe (un carafon) and a floweret (un fleuron). He registered this mark twice, in 1798, and 1803. He was received as a master silversmith for Paris on 27 May 1789, by letters patent. No end date is given, although he was mentioned in the Almanach Azur until 1816. See Arminjon, v. I, no. 02849, p. 284.
Bourguignon had a career under the Ancien Régime as well. Nocq tells us that he registered on 27 May 1789 with letters patent, sponsored by Henry Louis Dutry, and registered his mark on 17 June 1789, initials PB, symbol a holy spirit (un St-Esprit). At the beginning of his career he worked at cour Lamoignon until 1793, then moved to 222, rue St-Honoré. In 1795, at age 39 he married Jeanne-Catherine-Eléonore Dutry,
presumably his sponsor’s daughter. See Nocq, v. I, p. 176.
The spoons might not be original to the jam jar, but are definitely appropriate for time period, and form - length and shape. They were made in Paris of 950 standard silver in 1819-1838 as indicated by the silver standard mark of the head of Michelangelo facing right and a guarantee mark of a grotesque mask. The maker is Augustin-Louis Cottin, spoon maker (cuilleriste), initials ALC, symbol a spoon maker’s hammer (une masse de cuilleriste). Cottin worked in Paris at cour Lamoignon, at no. 8 then no. 7, the same street where Bourguignon worked until 1793. He registered his mark twice in 1810-1811, and 3 March 1826, erased 8 April 1828.
Hope this helps.