Enter the serial number from the pocket watch movement below. Do not use the case number. Serial Number Tip

Pocket Watch Serial Number Lookup - Hamilton, South Bend, Illinois, Rockford, Waltham & Elgin Pocket Watches
  Serial Number:
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Hamilton Pocket Watch Regulators

These are known regulators used on Hamilton watch movements. The regulator is used to adjust the balance wheel's rate of oscillation in order to improve accuracy of the watch. Several varieties of watch regulators were used in movement designs, most of which were patented, often called "Patent Regulators." The best regulators offer extreme precision while adjusting the rate of oscillation. A patent regulator was often an indicator of quality.

Name:Bosley
Inventor:Joseph Bosley
Patent Date:c. 1755
Patent Number:
Name:Reed
Inventor:George P. Reed
Patent Date:Feb 5 1867
Patent Number:61867
Name:Goldthwait
Inventor:William Goldthwait
Patent Date:May 6 1890
Patent Number:427072
Name:Hamilton Spring
Inventor:(Reed Variant)
Patent Date:Feb 5 1867
Patent Number:61867