Pocket Watch Database
"7745" 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 U.S. Watch Co. (Marion, NJ) 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:
United States Watch Co. (Marion)
Grade: I.H. Wright
|Manufacturer:||U.S. Watch Co. (Marion, NJ)|
|Manufacturer Location:||Marion, New Jersey|
|Movement Serial Number:||7745|
|Variation:||No. 33 1/2|
|Estimated Production Year:||1867|
|Movement Markings:||I.H. Wright
Mch 13th '66