I have my grandfather's retirement watch from 1953 (date code L3). I've looked through the database, but cannot find any model that is similar. I did see an advertisement for an Ellsworth model that seemed to match this watch's look. The case serial number is 6890867, 14k gold and no indication it has jewels. I have not opened the case. It keeps great time, but if it gets cold it will stop. I took it to one jeweler, but they did not want to open it for cleaning because they said if it's keeping good time leave it alone. I appreciate any help in its identification.
Case Serial No.