Facts:   - death place: oxford    - birth name: 1650 1 21 yes    - death date: 18 july 1722      - birth date: 1650    - name: john knibb    - nationality: english    - birth place: claydon , oxfordshire    - occupation: clock - and watchmaker   Based on these bullet points, write a short biography describing the life of john knibb .
A:
john knibb -lrb- 1650 -- 1722 -rrb- was an english clockmaker born in claydon , oxfordshire .he produced various clocks and watches including bracket clocks , lantern clocks , longcase clocks and some wall-clocks , as well as building and maintaining several turret clocks .even though his main market was catering to customers of modest means , he also dominated the higher-quality sector .only six of knibb 's watches are known to survive .