From 'For Sale" section:

Colonel, see 1968 Gun Control Act <http://www.atf.gov/publications/download/p/atf-p-5300-4.pdf>

Section 921 contains the definitions of a firearm (a)(3) which specifically excludes antique firearms from the provisions of the GCA. Par.(a)(16) defines Antique Firearm as 1898 or earlier. What this means is that since 1898 and earlier guns are not treated as firearms under the act, none of the transfer or record keeping provisions of the Act apply.

There are FAQs here, but they seem to have been revised under the Obama regime to include practically nothing of value to anyone.<http://www.atf.gov/firearms/faq/>

Hope this is helpful...Geo