Just over the size of a half dollar, approximately 35mm. There seems to be a small hairline crack to the face, best seen in photo 4. There is some denting to the back of the watch, and there is no monogram present. I assume the rose gold tint to the outer band was gold plating, but is starting to be worn off.
Antique PAT 1874 Small Twist Handle Pocket Watch Wind Up Winder Key
Not sure of working condition.