Tiffany 18k Gold & Lapis Clock

I inherited this clock from my father, who was a jeweler in Texas. It's marked Tiffany & Co Paris, 18k, and weighs a good amount, probably 2-3 ounces. It's 2" diameter. The face is lapis, and the hands are also gold, but they came off in shipping, but they can be reattached by a jeweler. It was recently cleaned & serviced last year. Anyone know when it's from, how much it might be worth, a good honest source to sell it?
Thanks in advance