Gorgeous late 19th c silver-plated large sauce boat rococo st Christofle Marly ?

Description

Magnificent late 19th c French silver-plated large sauce boat (with internal bowl)
rococo style
Nul Bien Sans Peine & B engraved (refer to photo 2)
Christofle silversmith (Old Marly pattern ?)
very good condition (scratches, small wears of the plating : photo 5)
dimension 29,9*18,9*12,8cm (11,77*7,44*5,04inch)
weight (with internal bowl) 1424gr (50,23oz)