This was a gift received a couple decades ago and worn only occasionally.  The pendant is about 1 1/2" (40mm) at its widest point and the original jump ring is still in place.  All you need to do it provide the chain for hanging.  The clock face is in great condition and works well, but I always wanted to remove the clock and mount a cabochon (semi-precious gemstone or mineral) in its place, but I never got around to it.  I did determine that a 250mm cabochon would fit perfectly.  I would like to rehome this little piece with someone who will wear and appreciate it. Instructions for replacing the clock battery and a gift box and packing are including with sale.  See pictures.