I collected all the Chorley, Churley, Charley (none available for Charley) wills when we visited Kew last year and a quick read does not reveal Mary Charley or Mary Pincombe mentioned. The wills are, primarily, from first sons and the only baptism that would work for Mary Charley thus far is 21 Sep 1735 at Kentisbury and the daughter of Hugh and Mary Charley.
Unfortunately the wills from Kew did not reveal any new information although a couple of them are for the Uffculme Chorley/Churley family.
A list of wills were also held by the Devon Record Office (destroyed in WWII)
Charley Escott Kentisbury DEV 1806 W
Charley Grace Tawstock DEV 1772 A
Charley Grace Combemartin DEV 1843 W
Charley Hugh Kentisbury DEV 1716 W
Charley Hugh Arlington DEV 1741 W
Charley James Chittlehampton DEV 1741 W
Charley Joan North Molton DEV 1822 W
Charley John Kentisbury DEV 1682 A
Charley John Kentisbury DEV 1717 W
Charley John Kentisbury DEV 1744 W
Charley John Tawstock DEV 1769 A
Charley John Tawstock DEV 1772 A
Charley John Kentisbury DEV 1781 W
Charley John Combemartin DEV 1835 W
Charley John Combemartin DEV 1838 W
Charley Margaret Kentisbury DEV 1756 W
Charley Martha Barum [Barnstaple] DEV 1747 W
Charley Richard Combemartin DEV 1857 W
Charley Robert West Buckland DEV 1812 A
Charley Thomas Tawstock DEV 1742 W
Charley William Arlington DEV 1720 A
Charley William Arlington DEV 1731 A
Charley or Chailey John Kentisbury DEV 1843 W
Charly John Kentisbury DEV 1643 A
In general this Charley family is further north or west from Bishops Nympton and I am left to wonder why Mary Charley is at Bishops Nympton. Why do they marry at Bishops Nympton? Being able to solve that mystery would probably also direct me to the correct family line for Mary. John Pincombe died after Mary so that excludes finding anything extra because of widowhood. The John Pincombe/Mary Charley family moved away from Bishops Nympton by the mid 1800s as far as I am able to determine. My line John Pincombe and Elizabeth Rew (descendant of Robert Pincombe (3rd son of John Pincombe and Mary Charley)) moved to Canada along with the only sister Elizabeth married to Richard Elworthy with Thomas, one brother, lost at sea with his family emigrating to Canada. George, another brother, lived near London UK and emigrated to Australia. Robert, the eldest son, emigrated to the United States the earliest of all the family. The youngest two sons remained in England but farmed in Somerset/Gloucestershire area for one and the second ran a milk business first in Birmingham and then returned to Gloucestershire late in life (he did not marry). The youngest brother Philip is the ancestor of many of the Pincombe families living in the Gloucestershire area.
Looking at the list of wills I spot two that may be significant
Charley Hugh Kentisbury DEV 1716 W
Charley Hugh Arlington DEV 1741 W
Earlier I had found baptisms for the children of Hugh and Mary Charley at Kentisbury and Arlington
1710 11 4 Christening William Charley Hugh Charley Mary Kentisbury
1712 12 4 Christening Mary Charley Hugh Charley Mary Kentisbury
1714 2 26 Christening John Charley Hugh Charley Mary Kentisbury
1735 9 21 Christening Mary Charley Hugh Charley Mary Arlington
The spread between the last two children just seemed to be too great (21 years). Interestingly an unknown
The father of Hugh Charley was John Charley married to Charity
There was a Mary Charley baptized 23 Feb 1719 and daughter of John Charley and Elizabeth (Richards) Charley. She was baptized at Barnstaple and I believe she married John Richards at Barnstaple in 1745. I have eliminated her from consideration.
As well there was a will for a James Charley in 1741 at Chittlehampton (3 miles from Bishops Nympton).
The actual parentage of Mary Charley is unknown for the moment but the likelihood of her being the daughter of Hugh Charley is strong. I need to research other avenues that might point me to further proof for this linkage. The death of Hugh Charley in 1741 when she was only six years old could well account for her no longer being in Arlington where there was only the one Charley family (her own) and her being present in the Bishops Nympton area to marry John Pincombe. One item that makes me doubt this somewhat is the naming of the sons of John Pincombe and Mary Charley - John was undoubtedly named for his father and grandfather. William is another name in the Pincombe family and the elder brother of John. Robert does not occur in the Pincombe family but Thomas has in the past (four sons in total). There is a William Charley who would have been old enough to be married in 1733 and son of Hugh which brings the scenario of her being a grandchild of Hugh and Mary Charley into focus (and the naming of the second son William).
Next study time I shall look at the Land Records for the Charley family in Devon.