Unidentified - French Ladle with Possible Swiss Hallmark?

[odsey]

I had recently come across this 19th Century French Silver Ladle, by Guillaume Deninger, however was intrigued by a mark I was not familiar with.

The piece is marked with a French Mercury export mark, alongside a mark of a half eagle, and key in a crest, above the initials J.D. So this mark is definitely the Coat of Arms for Geneva, however the initials underneath are puzzling me. Could this be from a silversmith importing the piece? Or would anyone else have any other suggestions?

I have uploaded some higher resolution images to the following link: http://imgur.com/a/08hJC/all

Any help is greatly appreciated!

Josh