I think he's Henry Thomas Breadmore Caswell 7 jun 1883
Does that make sense?
Not if he was getting married 99 years before his birth. 
Whoops!
I found this
http://www.ancestryhost.org/caswells/FamilyTree/family.php?famid=F145and
11-Nov-1832; William CASWELL son of Thomas & Mary CASWELL Blacksmith, Holditch Thorncombe Baptisms
12-Oct-1834; James Cook CASWELL son of Thomas & Mary CASWELL Blacksmith, Holditch
01-Jan-1837; Thomas CASWELL son of Thomas & Mary CASWELL Blacksmith, Holditch
12-May-1839; Richard CASWELL son of Thomas & Mary CASWELL Blacksmith, Holditch
These are blacksmiths = must come from the Wiltshire line
14 8 1753 John Caswell of Chardstock & Jone Butcher of Musbury married
There seems to be a LOT more Pitchers and Caswells around Netherbury
13-Sep-1713; George HODDER & Katherine CASWELL of Thorncomb Married
Lets get a gedcom file going, I need to work these trees out. There seems to be two family groups right now, the 1740s and the 1820s. Does anyone have a gedcom of the early line?