Nice well running Hamilton Model 23 19 jewel Chronograph. Housed in a chrome case with the black dial. This watch appears to be running and functioning properly. I have no idea the last time it was serviced. It is a model 23, 19 jewel. According to the serial number, it was made in approximately 1942. Pendant set and winding. This watch functions properly, time wise as well as the chronograph feature. The sweep hand functions correctly as well as the top minute sub-dial and it advances properly. Once running, one push to stop and another push to clear back to zero. Be sure to see the YouTube link below to see it functioning properly. The case back is smooth with no writing present. Great collectable watch especially for that military collector! Be sure to look at all the pictures. Feel free to contact me with any questions… Thanks for looking!