In order for a our larger cannons to be considered antiques and not subject to ATF requirements they have to meet two criteria.
1. Not capable of firing fixed ammunition
2. Manufactured in or before 1898[/list:u]
They can also be replicas of guns meeting the above criteria.
To help identify guns meeting this criteria I am opening this post. This post will contain links to websites showing pre 1899 cannons.
This post will be left open so you may post to it at anytime. There will be a link to this post put in the reference library sticky at the top of the board. If you find a site to post to this board and you can't find this board go to the reference library and click on the link. This post will then open and you can post to it. It is preferred that you post websites that have pictures. Websites giving year made are also useful
If you want to search for old cannons on the internet try using
http://www.google.comHere are some suggested topic that you could research.
(75mm) Canone de 75 Mle 1897
(76mm)15pdr BLC Field Gun
77mm Field Gun M96nA
127mm) Ordnance BL 5in Howitzer Mk I
19th century artillery
Artillery of the Boer war
Artillery of the Franco/Prussian War
Artillery of the Spanish American war
or any other war of the time frame
I have posted up a few to get you started. What else can you come up with?