Although Rita and Eric are dealing with a New England site, there may some
benefit in looking at Carl R. Lounsbury's _An Illustrated Glossary of Early
Southern Architecture and Landscape_ (1994, Oxford University Press). It
provides some fairly detailed information on early nails and, in fact
distinguishes/defined brads and sprigs for the Colonial period.
 
Hope it is of help.
 
Michael Trinkley, Ph.D.
Director
Chicora Foundation, Inc.
PO Box 8664
Columbia, SC  29202-8664
803/787-6910
Email: [log in to unmask]