Here is the information I have based on my complete lack of knowledge. The watch has a serial number 739128 which shows an estimated production run in 1903 of 1,000 of these watches. The watch is 1 1/8" in diameter, leading me to believe it's a size 3( The inscription on the case is for a woman. I broke the face-plate trying to fix the watch, it was stuck. I pulled out six of the jewels and the winding screw, not sure if that's what it is called. The face is great, dials are a shiny blue and is an intricate face for it's day.