Baptised 2/1/1595 at St. Dunstan, Stepney, London. Married at Church of St. Mary Aldermary, London (Register of St. Mary Aldermary, London, pg. 75).
This conflicts with note from http://www.delanet.com/~rbarry/jadc02.htm#1845C2 which states Thomas was a member of St. Mary Aldermary but that he and Hannah were married at St. Michael Paternoster, London England, where Hannah was a member.
There were numerous Thomas Dunscombe's born in the late 1500's and cited in the International Genealogical Index. Only two of these were baptised in London (both sons of Christopher, presumably the first died young). Since it is certain that the Thomas who went to Bermuda is the one who married Hannah Jadwyn of London, I have concluded the Thomas baptised in London is the most likely of these to be Hannah's husband. This Thomas baptised 2/1/1595, St. Dunstan Stepney, London (International Genealogical Index, London). There are other Thomas Dunscombe's in the IGI noted as being christened during the late 1500's:
2/2/1591 in London, relative: Joseph Duncombe (as spelled)
Film 183580 page 241 reference # 8482.
2/2/1593 in Crediton, Devon. Father: Walter. Batch C050741.
2/10/1594: Perrannthnoe, Cornwall, England. Father: Benedict. Batch C022232.
2/6/1597: Willesborough, Kent, England. Batch C047561.

Jadwin family web site by Regina Barry (http://www.delanet.com/~rbarry/jadg02.htm) states that Thomas was born in London, before 1600. E-mail from Regina Barry 3/1/2000 indicates the London location for Thomas' birth is a guess on her part.

Register of St. Michael Paternoster. London, England. 1558-1653, LDS Family History Library, 35 North West Temple St, Salt Lake City UT 84150, FHC film 0374505. Chronologically arranged, O.S. dating, English. Generally legible. No Jadwyn entires found 1636-1647. "MARRIAGE: Thomas Dunscombe of the parish of St Mary Aldermary and Hanna Jadwyn of this parish were married the xii of April by Haynes 1618."

Notes on Thomas Dunscombe from Wilkinson, Henry. Bermuda in the old empire. New York : Oxford Univ. Press., 1950: Thomas Dunscombe is described as a gentleman (page 108). The Dunscomb name was associated with the Bahamas as early as 1671 (pg. 339). Thomas Dunscombe was a Counsellor, appointed from Pembroke for one year in 1626 (pg. 401).

Thomas signed a 1623-1626 document complaining about the plight of the Bermuda tobacco growers (Lefroy, J.H. Memorials of the discovery & early settlement of the Bermuda or Somers Island, 1511-1687. London : Longman's & Co., 1879, pg. 382). Thomas was appointed between 1629 and 1637 to a position to aid in the fair accounting of tobacco (pg. 508). Thomas is mentioned as a witness in the witch trial of Christian Stevenson (pg. 610-618). Stevenson was hanged for witchcraft on May 20, 1653.

Virkus, in The Abridged compendium of American genealogy." Vol. III, 1928, Baltimore, Genealogical Pub. Co., reprinted 1968, pg. 169, claims Thomas was with Sir George Somers on the 1609 voyage which shipwrecked on Bermuda. Thomas was probably about fourteen years of age at the time.
Notes by Thomas Donovan Dunscombe indicate Thomas & Hannah came to Bermuda in 1624 aboard the "Return."
The web site "Bermuda genealogy and history" at http://www.rootsweb.com/~bmuwgw/rightside.htm
claims the ship "Return," Captain Dunscombe, master came from England in 1624, apparently carrying an indentured servant named Christopher Smith to Virginia - Elizabeth Citte. The site notes this information was recorded in the New York Public Library, 42nd St., New York City.

A deposition by their son Samuel dated November 8, 1705 sheds light on the family:

"Bermuda

"The affidavit of Samuel Dunscombe and Thomas Sears, both of Pembrok Tribe, and aged each of them seventy three years or thereabouts. These deponents being duly sworn upon the Holy Evangelists of Almighty God upon their oaths do say that they severally knew Hannah Jadwyn, one of the daughters of Thomas Jadwyn, formerly of London, cutler, deceased, who had issue Robert Jadwyn, who died without issue, the said Hannah Jadwyn, and Susannah Jadwyn, alias Sharrowe, who has also no issue living, that these deponents knew of or have heard that the said Hannah Jadwyn intermarried with Thomas Dunscombe, late of these islands, by whom she had issue Jadwyn, Philip, Thomas, John, the said deponent Samuel, Nehamiah, Susannah, and Hannah, that Jadwyn Dunscombe died without issue and that Philip Dunscombe had issue Thomas Dunscombe now living, who was born in these islands, never in England, that these deponents, as either of them ever heard, of these, all the rest of the children of the said Hannah, except the deponent Samuel Dunscombe, are dead, and no issue living. And that they had heard the last will and testament of the said Thomas Jadwyn, formerly cutler of London, read, which said will bears the date the 4th day of November, 1626, and that they verily believe the above-mentioned Hannah Jadwyn to be and always reputed to be the eldest daughter of the said Thomas Jadwyn, the testator, from whom the said Thomas Dunscombe now living survives aforesaid. And further these deponents say not.

"Sworn to before His Excellency the Governor Samuel Dunscombe
this 8th day of November, 1705
the mark of
                          Thomas Sears

(Composite Volumes 4,3, p. 199-200)

The statement in this document that there are no living descendants of Thomas and Hannah, other than Thomas son and Philip and Samuel's own children, seems dubious. Samuel's brother Thomas had four children living as late as 1688, and this statement would further indicate that all of Samuel's numerous nephews and nieces died by 11/8/1705. If that is true then Samuel must be the father of the Edward who wrote his will in 1733, husband of Hannah, even though Samuel did not mention this Edward in his will (neither did Phillip's son Thomasin his 1710 will nor his son Thomas in his1729 will). There is also a Nehemiah Dunscombe mentioned in various documents about 1730. It would seem likely that this Nehemiah is a son of Samuel's brother Nehemiah. The statement about Robert Jadwyn dyeing with no issue also apears to be in error as I have a record of him having at least six children. The meaning of the word "issue" in Samuel's 1705 affadavit is also in question. Its legal definition usually means "children or descendants" but it is possible Samuel only meant the more limited "children."