Pre-Revolutionary Dijon Mustard Pot from 1784, Maker JSP

[ShinySpoon]

Hello everyone,
I’d be grateful for your help once again in identifying a pre-revolutionary French object. This time it’s a mustard pot that carries a total of 12 silver hallmarks: six on the lid and another six, identical ones, on the body.
The six distinct hallmarks are as follows:

• 1. Combined letters (uncertain – could anyone identify this?)

• 2. Maker’s mark with the letters J, S, and P

• 3. A crowned letter P with the number 84 inside (I believe this is the charge mark for Dijon, 1784—am I correct?)

• 4. A fly mark (which I understand to be a contremarque, though I would like clarification on its practical meaning)

• 5. Parrot’s head (discharge mark, 1783–1789)

• 6. One additional hallmark I have not been able to interpret

Could you please confirm whether my interpretations so far are accurate, and especially explain the purpose of the contremarque in practice?
Thank you very much in advance for your guidance!
Best regards,
David
P.S. I’d also appreciate your recommendations for reference books you use to identify such objects.

[Bru5no]

Hello,

1. Double L : charge for small objects, Paris 1782-1789.
2. Probably Jean Simon PONTANEAU, Paris after 1776. The description of his mark is "(J, mont d'or, S) sous fleur de lys couronnée, P en pointe". The other three silversmiths with JSP letters have a different symbol easily identifiable (tête d'aigle, hermine and quintefeuille).
3. P84 : city mark for Paris 1784.
4. Fly : contremarque 1789.
5. Parrot's head : discharge for small objects, Paris 1786-1789.
6. Peasant woman's head : discharge for small objects, Paris 1782-1786 (Turn the image a quarter to the right).

I would say that this pot was made in 1784 in Paris by Jean Simon PONTANEAU, recontrolled in 1786-1789 and in 1789.

The contremarque is used at each change of fiscal marks to validate the objects that are still (or again) for sale by silversmiths. The last change in the Ancien Régime was 1789 in Paris.
I use Christophe GINTER, Les 6000 poinçons de l'orfèvrerie française sous Louis XVI (1774-1791).