Postby JayT » Sat Jan 21, 2017 9:10 am
Thank you for the additional information.
Above the maker's mark I see the "feathered" right leg of the crowned A charge mark, used from 1783-1789, and you show the parrot head discharge mark for medium items, in use for the same period.
I believe the maker is Louis-Alphonse Demoustier (also written Dumoutier or Desmoustiers). His mark was LAD and a crescent under a crowned fleur-de-lys and two grains.
Demoustier registered this mark on 13 September 1758, and was listed as working and living on Rue de Harley in Paris from 1759 until 1787. Thus your spoon was made towards the end of his career.
See Nocq, v. 2, p. 65.
The date letter mark is too distorted to read, but with the dates of the charge and discharge marks along with the working dates of the maker, you can narrow production of your spoon to 1783-1787.
Given the poor state of the marks, someone else might come up with a different or better attribution.