Such a shame that the marks on your attractive spoon in the Filet/Coquille pattern can’t be seen properly: blurred and dirty. You don’t do it justice.
You have correctly identified the year and place of manufacture.
The maker was Jean-Baptiste Leguerinière, mark the initials JBLG under a crowned fleur de lys, 2 grains, and a pedestal table (un guéridon) as symbol. He first registered a mark on 14 August 1727, residing at rue de la Savaterie. By 7 October 1740 he was working on the Pont au Change. He is no longer listed 1748. Thus your spoon was made at his first address.
Leguerinière was the son of a silversmith of the same name, who worked from 20 January 1717 until his death in 1748, when his widow took over the business until 1751. Father, widow and son all worked on the Pont au Change, presumably together, and they ceased activity at about the same time.
See Nocq, V. III, p. 87.
Hope this helps.