A rare garniture most possibly vieux Paris

This garniture came in the big bought Sergio did a year ago, that of the Muller Freres vase. It is damaged: one of the vases lost one handle and the base of the clock is broken in the back but glued. I had never seen something with so many black. It is very old: there are inclusions of ashes in the white porcelain inside the vases and some bubbles (first picture upper white part of the two vases). The shape and the style of the enamel is French for around 1860, perhaps a bit older. Also the gilding is very similar to some old Paris porcelain I have. The porcelain is marked, last picture, but could not find it. It seems and R and a G inside interlaced circles and a four leaf clover in the middle. Can anyone say something about its origin?