Pocket Watch Database
Access Date: December 01, 2023
"auth" could possibly indicate the grade of the watch and not the serial number of your movement. Serial numbers are usually more than a few digits.
Due to the lack of existing factory records, our E. Howard Watch Co. (Keystone) database has been reconstructed using observations of known watches.
As a result, the information may contain inaccuracies. Please let us know if you have details that can improve the database.
From the American Horology Archive:
E. Howard Watch Co. (Keystone)
|Manufacturer:||E. Howard Watch Co. (Keystone)|
|Manufacturer Location:||Waltham, Massachusetts|
|Movement Serial Number:||Unserialized|
|Estimated Production Year:||1902|