.. Used to have one similar to what's described - usually these are marked must de Cartier (mine was black dial).. And vermeil - gold plate over silver case IIRC. Movement wise, if it's the older ones - Cartier badged eta (cal.71?).
..... But ... I also seem to recall there are some or were Paris badged tanks with more desirable movements - any chance of pictures ..?
[.. Didn't think modern solos had any with non Quartz ?]
al