I've been told that the hollow brass projectiles for WW1 French Canister rounds are very hard to get hold of. I know I've certainly never seen one on my travels, but just how rare are they?...and consequently how valuable?
Here's a picture of one about two thirds of the way down this link...
http://www.passioncompassion1418.com/decouvertes/english_fusees_munitions.html
Here's a picture of one about two thirds of the way down this link...
http://www.passioncompassion1418.com/decouvertes/english_fusees_munitions.html