Rob Forsyth
A very simple family tree showing only those Fardons of Deddington/Adderbury/Woodstock who I know were definitely watch/clockmakers.  Unfortunately there were 5 x John Fardon and 2 x Thomas Fardon  active from around 1720 to 1870, which makes attribution somewhat problematic..
 
 John[1] Fardon b: Abt. 1700 d: 1743 Deddington
     2nd Wife of John[1] Fardon:           
    +Mary Cox  b: Abt. 1700  m: 1734  d: Abt. 1760
        John[2] Fardon   b: July 11, 1736 Adderbury  d: 1786 Adderbury
        + Mary Grange
        + Sarah Cox on 26 Jun 1772 d:Sept 1887
            Thomas[1] Fardon  b: Abt. 1757  d: 1838
           +Mary Churchill b: Abt. 1760 m: July 2, 1777 St Mary's Adderbury d: 1785 Deddington
                 John[4] Fardon b. Mar 23, 1781 St Mary's, Adderbury  d: Feb 16, 1865 Woodstock age 83, 
                +Elizabeth Malings b: Feb 15, 1782 Deddington  m: May 13, 1802 Deddington, d: Mar 25, 1847                
                     Thomas[2] Fardon  b: June 17, 1803 Deddington d: 1887 Woodstock
            John[3] Fardon b: Abt. 1760  d: Bef. 1817, prob Aug 25 1801 Deddington PR "that shot himself"
          +Elizabeth Manning  b: Abt. 1760  m: June 5, 1790 Deddington   
                 John[5] Fardon b: Mar 9, 1792 Deddington  d: Feb 1, 1820 Deddington PR no age given