Can anyone throw more light on the age and provenance of our white marble mantel clock? The movement is stamped by Japy Freres et Cie for the grande medaille d'honneur at the 1855 exhibition. The clock face, in roman numerals, is marked Yates a Paris. It has a small retard and advance mechanism above the XII. Both the movement and the pendulum bob are stamped with the serial number 2384, and the back plate also has L stamped above the serial number and 6 close to the bottom edge. It rings the hour and half-hour with a mechanism wound separately. It is running nicely in beat now that it is properly level, and keeps good time for a clock of this age and type. Am I right in thinking it is quite unusual? I haven't seen another one from this era that is so plain and lacking in ornament. I very much look forward to hearing from anyone who knows about the development of these clocks.