For offer is a 1877 Rockford Model 1 Pocket Watch 18s 9j Low Serial #3688. Ticks and moves however we have not fully examined, and we make no warranty as to the functionality of the watch. Sold as is.  We do not have the key for the watch. PLEASE NOTE THIS IS A NICKEL-ALLOY CASE (FAHYS WATCH CASE COMPANY)

FROM THE AMERICAN HOROLOGY ARCHIVE:
Rockford Watch Co.
Manufacturer:Rockford
Manufacturer Location:Rockford, Illinois
Movement Serial Number:3688
Model:1
Estimated Production Year:1877
Size:18s
Jewels:9j
Jewel Setting:Screw-Set
Movement Configuration:Adaptable
Movement Finish:Gilt
Movement Setting:Key
Plate:Full Plate
Regulator:Hurd
Movement Markings:Rockford Watch Co.
Data Research:1907 Rockford Serial List
Case:Various
Database Version:v52.270