hard to tell... they are large enough to be documented so why not?
if you search for Hatteras on boatinfoworld, a 1963 33 footer comes up on the first page... 13 NT, 16 GT, 12.3 beam
The brochure for the 34 Sedan of that vintage shows a draft of 3'
http://www.hatterasowners.com/models.htm