The clock is black marble, with a granite face. The information inside the clock is as follows:
S. Marti et cie, Medaille de BronzeL, Frame No 4370, #57 at bottom of clock. 2 of the 3 screws appear to be marked. The clock is an exposed escapement, jeweled. The information was obtained by a clock repairman. The clock weighs approx 50+ pounds.