Christofle chamber stick or candle holder

'Bougeoir' Signed & Numbered on the bottom by "CHRISTOFLE" + "C four stars and balance C" + "C METAL BLANC STAR + 4"(see Photos). Everything is original. This is one of the first models made by Christofle. The chamberstick is heavy and the workmanship is very fine as can be seen from the handmade wing nut which holds the piece together (see P) Measurements are: about 6.5" long. It is not in very good conditions since it has lost all the silver, have several surface scratches and wear but no nicks or dings.
The explanation of the marks is rather complex. You can find a lot of information here
http://www.ascasonline.org/articoloGIUGN130.html
From there I had copy the whole paragraph. The mark in the square box is called the poinçon de responsabilité and refers to one of three legislated marks on French silver plate. Its use on silver plated goods in France was decreed on 26 May 1860 to consist of the maker’s initials and symbol in a square box. A bee image between the balance plates is absent; instead there is an image of a flower (rosette). Another new element is the designation of the silver content (so-called marque de grammage) in square boxes instead of the former lozenge-shaped ones. Finally, the presence of a new specific element, the rhomb with the inscription "METAL BLANC", should be added. We will call it the "mb" rhomb mark. This mark appeared sometime after 1878 and was used for marking the Maillechort (Alpacca) base metal (Fig. 2 b). There was no marking for other base metals used for silver plating (Fig. 2 a), but the use of these other base metals was continued after the introduction of the rhomb mark, though in smaller quantities. My calculations show that around 40% of the silver-plated Christofle items, issued in 1878-1935, do not carry the "mb" rhomb mark.
The mark seems not to correspond because this is brass so the mb rhomb mark must not had been added?